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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

AIBU to not have sister and her autistic child (nephew) in my home.

1000 replies

BetUWanna · 29/01/2026 17:27

Hi all,

I'll try and give as much detail here with trying to remain anonymous. I've NC for this as this will have outing details in it. I'm here to ask for some genuine advice and opinions on a current situation with my family. I'll try not to drip feed so this may be long.

i (30F) have an older sister aged 33. She is my half sister with us sharing 1 parent.
she has 2 children, 5 and 11, one who is autistic (diagnosed) and the other is NT. I also have a 4 year old myself.
She was young when she had her son who was diagnosed autistic when he was 8. I want to preface that she is a single mum, with both kids having different dads, so I'm not saying for a second that this is easy for her at all. I genuinely love her with my whole heart, but our relationship is suffering hugely due to her son's behaviour. She came to stay for Christmas at my home for 5 days. Some of the instances that happened over Christmas:
We were playing board games in the lounge, my nephew said he was going to watch his iPad. I had a Christmas tree at the top of my stairs, and while we were playing games he picked off each bauble individually and threw each one down stairs and most of them smashed to pieces. There was glass everywhere and there were little children who could have hurt themselves.
he picked up one of the pillows on the bed he was sleeping on, took it to the bathroom and peed on it. Left it there for me to find it. He ate his Christmas dinner with his bare hands, slapping gravy over his face and genuinely making a mess. He picked up a glass, launched it across my kitchen which ultimately chipped my wall and smashed. He refuses to use any sort of cutlery whatsoever. He refuses to brush his teeth, to the point he has black, rotted teeth at the front of his mouth. He's apparently been to the dentist and it's 'fine.' He hits, kicks and pushes my sister and the younger children including his younger sibling. I'm worried about my niece who has to live with this and the effects this is having on her. I have offered countless times for her to sleepover at mine with my DD, but it's declined each time.
He scribbled over my walls and regularly went outside to pee in my garden.

He is incredibly intelligent and my sister says he is high functioning, but i don't know if this is accurate. He is home educated and goes to his dad's house every other weekend. My sisters house is clean, he doesnt wreck things in his house, but if someone comes over his house he will start to lash out and misbehave. He will call us names and tell us he hates us.
I am worried for my sister as he is aged 11 and the same height as me, she cannot control or restrain him at all as he is just too strong. She has had training / classes for this but he is too strong. There is no respite for her. My relationship, and the whole families, is suffering now. We don't want to go to her house because he will lash out, mainly at her. We don't want him at our houses, because he trashes the place and can, at times, cause danger to other family members. What is the answer? My sister works hard home educating her children, and works part time when they are at their dads.

I can see this whole situation is isolating her from the outside world as she lives in fear of her son. I want to offer support, but aside from being a listening ear, I don't know what else I can do. I unfortunately won't allow him in my home now, as I have to keep my DD safe and I will not allow her safe space to be compromised. Which means my sister and niece don't come over, as they are always together.

can anybody please advise me on how / what I can do? Will this ever get better? She won't call out his behaviour as she is too frightened of him, which I understand. But it's straining our relationship hugely.

my relationship with my sister is hanging on by a thread. She has other friends and family members but they all seem to be in the same position as us which is isolating her further and resulting in her losing friendships. I am heartbroken for her. Please can anybody share any words of wisdom or any advice. My parents are in the same situation as me, they cannot cope with his behaviour in their home and their house has also been trashed over the years.

ultimately this is a disabled child who is being gloriously let down by the system.

thank you.

OP posts:
BetUWanna · 31/01/2026 10:55

RedToothBrush · 31/01/2026 10:51

If you are ADHD or autistic yourself I do think it's incredibly hard to engage with these services because of the paperwork work, advocacy issues and simply trying to get through on the phone. It's easier to disengage rather than try to navigate it because the process itself is so stressful.

It's a known issue no one wants to acknowledge properly and do something about.

I was diagnosed with ADHD at age 7.

there is no other autism in the family that I know of.

OP posts:
BetUWanna · 31/01/2026 10:58

Breadcrumbtrail · 31/01/2026 10:52

This is a complex situation and they all need help.

Absolutely agree with that.

Could pain from his teeth be triggering the bad behaviour I wonder. Toothache is excruciating.

Agree completely with your analysis of the medical situation.

Unfortunately there does often have to be some compromise around toys if one of the children is autistic. The shoes with flashing lights you mentioned for example…though maybe she could wear them to her dads?

I also think a long weekend with relatives a few hours away (I think?) and away from mum might be a bit much for many five year olds. Mine wouldn’t have gone at that age I know.

Is it a two bedroom house? Is there any possibility of moving? You’re right, they each need their own room desperately at this stage!

Edited

I spent a lot of time with my niece one on one over Christmas. I don't want to repeat specifically what she said to me as I don't think it's relevant. She wants to come and stay with me and my daughter, she's exhausted and worn out.

I just hope they all get the help they all deserve.

ima bow out now, but thanks to everyone who's commented and posted kind words, words of advice and support.

I don't want this to take up too much head space as it's my weekend with my DD as her dad has her next weekend. So I'm going to come off here now as i think I've got everything I could out of this thread.

if and when there's an update I may pop back in the future.

thanks again all!

OP posts:
RedToothBrush · 31/01/2026 10:58

BetUWanna · 31/01/2026 10:55

I was diagnosed with ADHD at age 7.

there is no other autism in the family that I know of.

Your sister is either autistic or ADHD or both. I would put money on it.

BetUWanna · 31/01/2026 10:59

Breadcrumbtrail · 31/01/2026 10:52

This is a complex situation and they all need help.

Absolutely agree with that.

Could pain from his teeth be triggering the bad behaviour I wonder. Toothache is excruciating.

Agree completely with your analysis of the medical situation.

Unfortunately there does often have to be some compromise around toys if one of the children is autistic. The shoes with flashing lights you mentioned for example…though maybe she could wear them to her dads?

I also think a long weekend with relatives a few hours away (I think?) and away from mum might be a bit much for many five year olds. Mine wouldn’t have gone at that age I know.

Is it a two bedroom house? Is there any possibility of moving? You’re right, they each need their own room desperately at this stage!

Edited

just to confirm, no, she doesn't have the money to move. They are in a 2 bedroom flat. I have given her thousands over the years and so have my parents. I think if she could move she would've had to.

anyway, enough from me, have a good day all!

OP posts:
Breadcrumbtrail · 31/01/2026 11:03

Enjoy your weekend with your daughter OP . This thread must have been exhausting for you. I hope it’s helped you and your family.

rainbowstardrops · 31/01/2026 11:13

I think you sound lovely and caring and obviously very worried for your sister, nephew and niece.
Your sister is allowed to parent how ever she wishes but to not seek medical help, or vaccinate your children etc is pretty much neglect. She would probably have so much support if both children attended school but it seems as if she’s adverse to anyone penetrating her bubble. Is it in case she feels criticised I wonder? She’s effectively pushing everyone away that could potentially help and that in itself, isn’t helpful for any of them.
Autism aside, your nephew needs boundaries and because he doesn’t seem to be receiving them, he’s become almost feral in his behaviour. Why hasn’t she taught him to at least use a fork? And not to pee in the garden? That sounds like lazy, ineffectual parenting.
He’s already 11. In another few years he’ll be the size of a grown man. She needs help with him NOW and I agree with you that your niece (and your sister) are and will be, in danger. You did the right thing contacting SS. I hope they step in and support all three of them.
You sound absolutely lovely.

GlitteryRainbow · 31/01/2026 11:14

Bess91 · 29/01/2026 17:58

I'm surprised you let them stay for 5 days. Or come over at all, really.

It's sad for him, but he wouldn't be welcome in my house. Why was his mum not supervising him?

He's not high functioning, he's not even toilet trained.

Deliberately peeing on something doesn't mean he's not toilet trained. He chose to pee on the pillow, he didn't do it accidentally.

Warmlight1 · 31/01/2026 11:26

Chickadee001 · 31/01/2026 06:24

Totally agree with you, however I do wonder about the 7% who disagreed - how would react if it was their home being trashed and disrespected like this?!!😣

I tipped the wrong box by accident- sorry poster I don't think you are unreasonable .

TheDaysAreGettingLongerAgain · 31/01/2026 11:35

Thegladstonebag · 30/01/2026 23:29

I’m really sorry but the system hasn’t let her down, she has chosen to put herself outside the system and while she’s entitled to do that, it’s clearly had serious repercussions for her, her son and her daughter. The price she’s paying for that is awful but the children are also paying. There are support networks for parents and good schools for children with ASD and that would have helped her and her son. And ultimately her poor daughter. I’ve got real safeguarding concerns here for both children and for your sister.

So we just let mentally ill people do what they like even if it's against their children's best interest?

Allowing mentally ill people do what they like is why vulnerable young women are having double-mastectomies too.

Mentally ill people are not in a position to make good decisions.

The state should not allow vulnerable young women to "home-school" their children. Children are not chattels. They are human beings with rights of their own. Their rights should be front and centre otherwise it's state-sanctioned child abuse.

Breadcrumbtrail · 31/01/2026 11:37

Warmlight1 · 31/01/2026 11:26

I tipped the wrong box by accident- sorry poster I don't think you are unreasonable .

You can usually change it, just press on the other one.

RedToothBrush · 31/01/2026 11:39

Failure to address your child's rotten teeth is regarded as neglect and is regarded as a reportable safeguarding issue on its own.

Social services seeing this and pinch marks in the wall and a child reacting violently to visitors is liable to result in intervention and the appointment of a social worker and required engagement with agencies.

So again you've done the right thing OP.

TheDaysAreGettingLongerAgain · 31/01/2026 11:52

SpaceRaccoon · 30/01/2026 22:13

OP just to make you aware, there's a contingent on here (and you're meeting them!) who will always prioritise ND male children, often older, often violent, at the expense of younger, vulnerable, often female siblings.

I think it's completely understandable that you have bonded more with your little niece, and that your concern is more with her. Mine would be too - you sound like you're the only one putting her first.

So please ignore the posters who would see her thrown under the bus, to the point of making up bizarre rules they're trying to enforce on you regarding how you may or may not try and help your own family members.

Let's set aside the fact that he's ND - she is the one who is most vulnerable here, living with an older male sibling on the cusp of puberty, favoured by his mother, not even her own bedroom. I do think there's a not insubstantial chance she could wind up sexually abused by him.

Edited

This is the biggest short-term risk and he is a half-sibling which increases the risk.

Breadcrumbtrail · 31/01/2026 12:07

Just to mention that school doesn’t always adequately meet the needs of their autistic students. I think too many see it as a clear solution here, and while they could well be right, they mightn’t be.

We weren’t able to find a suitable school for my autistic child even after several placements, and one survey has reported that 75% of parents feel their autistic child's needs aren’t met at school so I don’t think we’re alone. More ND children are homeschooled than NT ones and that’s for good reason usually.

So, while a school routine may benefit OP’s nephew, it doesn’t always work like that unfortunately. It depends what the services are like where they live and what settings are available.

I think it likely her niece would benefit from school.

I hope things work out for OP and her sister’s family.

drspouse · 31/01/2026 13:49

BetUWanna · 31/01/2026 09:36

I have explained here so many times but it's evidently not enough.
I have offered EVERYTHING to him, that I do my niece. I have offered to take him out, to pay for his swimming lessons, to speak to him on every FaceTime call, to buy the specific Christmas and birthday presents he asks for.

I can no longer offer to 'babysit' him because no one can go into his home without him becoming agitated and violent. I cannot simply go round and babysit him as I don't put myself in the firing line of a 5'4 well built male. You should know it's not that simple. He currently kicks off at the sound the intercom buzzer in his home and deliveries that knock on the door.

what would you like me to do? What can I offer him aside from financial support and trying to keep the line of communication open? I'm genuinely open to suggestions here hence why I posted but everything you have said won't currently work and isn't an option.

Then go round and spend time with them until he does become used to you.
See my suggestions above.

Blueskiesandrainbows · 31/01/2026 14:32

Hi OP I think you’ve had a really hard time on here, you sound so loving and caring and don’t deserve the goady comments.
I totally understand your concern for your niece, it must be heartbreaking for you, well done with trying to find a way forward.

LizzieW1969 · 31/01/2026 16:11

I do have some empathy for the OP’s DSis, as I know what it’s like to face violence from your child. My adopted DD1 (now 16) was violent towards me from the ages of 6-10. She was also occasionally violent towards DD2 (now 13). That has stopped, though she still has angry meltdowns and throw things.

She did, though, go to school and was mostly well behaved; she masked well and used to regularly explode in a rage on the way home. A TA once witnessed her lashing out and told her off.

She was never violent in other people’s homes, thankfully.

We were constantly fighting to get her the support she needed, but she only got her EHCP in time to go to a specialist college.

The one this is really hurting is the OP’s younger DNiece. I’ve seen in the years since DD1’s violence stopped just how damaging it’s been for DD2, who remained scared of her.

I think they really should be in school, home-schooling makes this an appalling situation for all of them, especially the younger niece.

pollymere · 31/01/2026 17:21

Terms like High Functioning aren't useful. He may be intelligent but he's acting out, clearly overwhelmed and lacking any boundaries. It's not healthy that he doesn't have formal education (whether at home or in an educational setting). He needs a support plan so he can learn to cope with the world and manage his ASD in an appropriate way. He is currently producing not only unwanted but inappropriate behaviours which ARE putting him and others at risk of harm. He needs ways to learn how to manage these before he does do serious harm to himself or others. He is really struggling to cope with his ASD and it won't get any better without proper support in place.

The peeing on the pillow and the bauble breaking strikes me as him communicating that he wants his Mum to give him attention and boundaries and actually support him, rather than sending him away with an iPad or just ignoring his behaviour. I'm sure he could use cutlery if he was supported and encouraged. I suspect his Mum is also treating him like a performing animal.

JoannaTheYodelingCowgirl · 31/01/2026 17:24

Are you even sure he IS autistic? Because this kind of neglect and poor discipline would make any boy feral, let alone an autistic one.

BeBusyDuck · 31/01/2026 18:17

DrRuthGalloway · 29/01/2026 17:42

Tbh most of these behaviours are not typical autistic behaviours at all. What happened as a result of these incidents? How did your sister deal with these situations? Why is he home educated, and does he have an EHCP?

A more typical autistic response to being in a strange environment might involve distress, anxiety, withdrawal or meltdowns, but this sounds unboundaried and like he's seeking a reaction.

A very young autistic child might break glass baubles for sensory reasons, but an 11 year old throwing them down the stairs doesn't sound right at all. Does he have ADHD and struggle with impulse suppression? Even so he should be getting a clear message that this was silly, dangerous, and thoughtless behaviour.

ETA a friend's autistic child used peeing on items as a high stakes tactic to try to avoid feared things. Could that be relevant?

Edited

You are wrong sorry. Every autistic person is different

B33cka8 · 31/01/2026 19:13

BetUWanna · 29/01/2026 17:58

Okay so to answer some questions:
why is she home educating? She doesn't believe in the school system. She sees it as a 'one size fits all' scheme and doesn't feel like it will benefit her children.
What other professionals are involved? - I don't know the answer to this. She doesn't have social media so isn't a part of any support groups. She doesn't believe in modern medicine, so she will only go to holistic doctors (she has spent an insane amount of money that she doesn't have doing this by the way). Her children aren't vaccinated. Although her son is diagnosed autistic and the appointments and assessments were initiated by her, so there have been some medical professionals in her life. She claims a certain benefit for her disabled child. Her children have never been in any childcare or education system, she has always home schooled.
Why wasn't she supervising him? He hasn't always been this bad. He is usually quite happy to put his headphones on and watch his iPad. He had done this many times before.

I think my sister has severe mental health issues and it's only really when I'm typing this out that I see the magnitude of it. She does have a therapist and from what she tells me has had therapy for a long time. She did have a very hard childhood herself and I think a lot of why she reacts like this is because of that. I don't want to say too much as it's very outing but we didn't know she existed until she was 16 and she spent her whole childhood in another country. My sister has absolutely no social media so I can share as much as I have, but I can't say too much more due to being outed and potentially people knowing who I am.

typing this out and actually realising what I'm typing I'm starting to wonder if this could potentially come under neglection. She doesn't live locally to us which is why when we did see her, she would stay for a few days. I've offered time and time again to pick up my niece and have her for a long weekend but it has been declined every time.

It really is such a shame for the young girl who isn't seeing what a healthy family dynamic, or male example/ role model is. It will undoubtedly impact her relationships throughout her life

TheWorthyNewt · 31/01/2026 19:16

Sje needs to send him to school.

Lorenzo86 · 31/01/2026 19:22

youalright · 29/01/2026 17:33

Ultimately this is years of parenting failures. Being autistic isn't a free pass to do whatever you want he still needs parenting and consequences for his actions. I've distanced myself from people due to lack of parenting as its annoying and effects my children

Lack of parenting?? You clearly don't have any disabled children. It isnt as simple as that.

ysette9 · 31/01/2026 19:23

How heartbreaking all around.

I am truly touched by the OP’s level
of care, concern, and determination to do the right thing. There is a lot of love that comes through these posts.

Reporting the neglect (child abuse?) and dangerous situation was absolutely the right thing to do. My fingers are crossed that the authorities come through and help. This is an entirely untenable situation.

JoannaTheYodelingCowgirl · 31/01/2026 19:33

Lorenzo86 · 31/01/2026 19:22

Lack of parenting?? You clearly don't have any disabled children. It isnt as simple as that.

Reread the thread.

She doesn't vaccinate the children, doesn't give them medicine, doesn't give them an education, lets both kids have rotten teeth, there is no discipline and the kids are expected to sit on their arses on the ipads all day

That is bad parenting

Lorenzo86 · 31/01/2026 19:50

JoannaTheYodelingCowgirl · 31/01/2026 19:33

Reread the thread.

She doesn't vaccinate the children, doesn't give them medicine, doesn't give them an education, lets both kids have rotten teeth, there is no discipline and the kids are expected to sit on their arses on the ipads all day

That is bad parenting

Exactly, no experience of parenting a disabled child. Try and get a child with a severe disability to brush their teeth and atte d the dentist...impossible! Try and get a disabled child to not be on a screen and engage in an activity not of their choosing....extremely difficult....do you have a disabled child Joannatheyodelingcowgirl???

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