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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:
liamharha · 16/02/2026 17:42

StartingFreshFor2026 · 15/02/2026 19:08

I think beyond calling social care, you're not doing the right thing and the way you talk about it all is icky. Appreciate that's just my opinion though.

Surely the aim should be for neice to stay with mum or be 50 /50 and have extensive support system in place from kids dad extended family.etc.,,you seem pleased tho op that dad has taken legal action ,,let's hope it's not out of the frying pan and into the fire
A very uncomfortable undercurrent to this thread .

BetUWanna · 16/02/2026 17:47

Spanglemum02 · 16/02/2026 16:25

If you're not married to the father, he has to come with you to register the birth or he won't be on the certificate. However he's be contributing and has a relationship with his daughter and presumably your sister is not denying that he is her father?

I think he needs to see a solicitor and talk to social services. I really hope your sister is letting them help her, because it worksucg better if you accept the help.

Yes he was meant to go with my sister to the appointment and she agreed to this but apparently just didn't tell him when she registered my niece. My nieces father alleges that my sister told him she can never have children (and didn't inform him of her son) when they were intimate. It resulted in a one night stand and ultimately they were both irresponsible but that's not relevant now as they can't take back that night.
He has been paying a set amount via bank transfer each month to my sister for my niece since before she was born.
He has a solicitor appointed and has done for around a year to try and get more custody / get on the certificate.

what would my sister gain from not putting him in the certificate? I don't know much about this at all it just seems a bit strange to not have him on there. He is married now with a child and lives with his new partner and child. My niece has her own bedroom at her dads house which is good too.

I can't remember if I mentioned earlier but we have all been blocked on WhatsApp / text (me and my family.)
this happens sometimes. Sometimes she will come back and ask for money and sometimes we're blocked for weeks and weeks at a time. I'm residing to the fact the relationship has broken down now, as sad as that is. As it dwindles any sort of relationship with my nephew in the future. But I'm stepping away from my sister now anyway, I don't know how long for. But I can't see me having a relationship with my niece through her father as going down well in her books at all. I still feel shit about it all. But I think the relationship with my sister is sadly over now.

OP posts:
BetUWanna · 16/02/2026 17:48

liamharha · 16/02/2026 17:42

Surely the aim should be for neice to stay with mum or be 50 /50 and have extensive support system in place from kids dad extended family.etc.,,you seem pleased tho op that dad has taken legal action ,,let's hope it's not out of the frying pan and into the fire
A very uncomfortable undercurrent to this thread .

I am extremely glad the dad is taking legal action. My sister has been negligent to both of her children and my niece is suffering immensely. As well as my nephew. It may be uncomfortable to read and I'm sorry about that, but it's even more uncomfortable to witness in real life I can assure you. Feel free to click off the thread if it's upsetting.

OP posts:
BetUWanna · 16/02/2026 17:49

RedToothBrush · 16/02/2026 17:08

Is there a birth certificate at all would seem to be a fairly reasonable question at this point.

Sorry if this is a daft question - what would she gain from not having a certificate at all? Would there be a reason for it?

OP posts:
Breadcrumbtrail · 16/02/2026 17:52

BetUWanna · 16/02/2026 17:49

Sorry if this is a daft question - what would she gain from not having a certificate at all? Would there be a reason for it?

Wouldn’t she have needed one for the nhs autism assessments. And to get the benefits she’s getting for her son?

Bertiebiscuit · 16/02/2026 17:55

I used to go to a nice crafting group until a woman started to bring her autistic son with her - he looked about 12 or so , big and very chunky. He would shout all the time, crash around banging into people and furniture, start banging the drums stored at the back of the room and generally make an utter nuisance of himself, and on one occasion he really scared me. His mother would just ignore him. Eventually i stopped going, at least partly because of him. His behaviour made me so anxious and unable to concentrate on my projects.

JoannaTheYodelingCowgirl · 16/02/2026 17:56

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JenniferBooth · 16/02/2026 17:57

liamharha · 16/02/2026 17:42

Surely the aim should be for neice to stay with mum or be 50 /50 and have extensive support system in place from kids dad extended family.etc.,,you seem pleased tho op that dad has taken legal action ,,let's hope it's not out of the frying pan and into the fire
A very uncomfortable undercurrent to this thread .

What i find uncomfortable is the attitude on this thread from some posters that you should be able to get away with anything if you have given birth

Birdsongisangry · 16/02/2026 18:02

If a child was in the full time care of a neglectful father, no one would question the mother taking legal action to get the child back in their care.
And from what the OP has posted we don't know anything about the dad's intentions around supporting or not supporting the child's relationship with her mother, only that he wants to take responsibility and protect the child. If posters think that has a 'uncomfortable undercurrent' I think that says more about their view towards men in general than anything OP has posted on here.
Yes Mumsnet is full of dad's who are abusive and shirk their responsibilities, but let's not take that to mean any dad who wants to do the right thing is abusive.

BetUWanna · 16/02/2026 18:02

Breadcrumbtrail · 16/02/2026 17:52

Wouldn’t she have needed one for the nhs autism assessments. And to get the benefits she’s getting for her son?

Edited

I would assume so but my niece isn't autistic so hasn't had any assessments. She didn't have a hospital birth either she had a 'free birth' at home. I don't know enough about it to comment really!

OP posts:
Tekknonan · 16/02/2026 18:03

She's making a huge mistake home-schooling him. He needs to structure and discipline of a school environment, and if he is high functioning, this kind of behaviour suggests stress, frustration, boredom and just plain being over-indulged.

I have a high-functioning, severely autistic granddaughter. Her school helped her amazingly. She is now an adult and can live an idependent life, works, had had a couple of relationships; but she says herself she needed the guidance she got in school, especially when she was younger. It really heped her to cope in a NT world. She still struggles sometimes, but she has a life and is moslty happy.

A good school will have the facilities to deal with him, give him the support he needs and help him to learn how to deal with his frustrations, anxieties, triggers etc. If she doesn't do something soon, his future looks very bleak.

Tableforjoan · 16/02/2026 18:12

A genuine free birth means she had no medical
assistance.

Which would fit with him not being allowed to go to scans.

adding fuel to the is she even registered if she claimed she would invite but then “registered” alone.

Also no cms so no proving the child exists as he just pays.

Be interesting as to what the courts are saying to him.

StartingFreshFor2026 · 16/02/2026 18:12

JenniferBooth · 16/02/2026 17:57

What i find uncomfortable is the attitude on this thread from some posters that you should be able to get away with anything if you have given birth

It's certainly not about "getting away with" anything. Many of us who think there is an uncomfortable undercurrent are also really pleased that OP called social services.

Woodfiresareamazing · 16/02/2026 18:20

BetUWanna · 16/02/2026 17:49

Sorry if this is a daft question - what would she gain from not having a certificate at all? Would there be a reason for it?

If she never registered her birth, she wouldn't be hassled re school, vaccines etc...

I do think niece's dad should take a dna test ... I really hope he is actually her father. And that she hasn't lied about that too.

BetUWanna · 16/02/2026 18:20

Tableforjoan · 16/02/2026 18:12

A genuine free birth means she had no medical
assistance.

Which would fit with him not being allowed to go to scans.

adding fuel to the is she even registered if she claimed she would invite but then “registered” alone.

Also no cms so no proving the child exists as he just pays.

Be interesting as to what the courts are saying to him.

She had absolutely no medial assistance at her birth. She hired a doula and it was just my sister and the doula at the birth.
is it such a thing, to have a child completely 'not in the system?' What would she gain from it?

my nephew is evidently in the system as he's been diagnosed with autism and she receives some sort of benefit / payment for this. But again I don't know a lot about that either so wouldn't know to question it.

OP posts:
BetUWanna · 16/02/2026 18:22

Woodfiresareamazing · 16/02/2026 18:20

If she never registered her birth, she wouldn't be hassled re school, vaccines etc...

I do think niece's dad should take a dna test ... I really hope he is actually her father. And that she hasn't lied about that too.

He has asked for one quite a few times and she has declined every time. Can he legally peruse a DNA?

we are aiming to have another call on Wednesday so we will see what comes of that.

OP posts:
Tableforjoan · 16/02/2026 18:26

BetUWanna · 16/02/2026 18:20

She had absolutely no medial assistance at her birth. She hired a doula and it was just my sister and the doula at the birth.
is it such a thing, to have a child completely 'not in the system?' What would she gain from it?

my nephew is evidently in the system as he's been diagnosed with autism and she receives some sort of benefit / payment for this. But again I don't know a lot about that either so wouldn't know to question it.

It would mean in her mind the government have no power or control over her child.

So they wouldn’t know she’s not in school or even being home Ed as she doesn’t exist. No health visitor checks because she doesn’t exist. No passport either however and a ton of paperwork once she’s older mind to prove she exists as a British citizen.

Dad needs to go to court to force a dna. However could be harder again if she doesn’t legally exist but social services will know there are two children there now so he needs to be full communication with them.

you can check local records where she was born to see if she was registered but I’m pretty sure you need medical paperwork technically to register a birth to again prove it happen as your own child. I’ve had a homebirth and even that got me a sheet of paper to as my baby was born from me at my home on that date witnessed by Mrs and Mrs midwife.

drspouse · 16/02/2026 18:30

As I posted up thread, but you aren't listening to me, this is definitely something people do to avoid anyone knowing about their children.

Breadcrumbtrail · 16/02/2026 18:32

BetUWanna · 16/02/2026 18:02

I would assume so but my niece isn't autistic so hasn't had any assessments. She didn't have a hospital birth either she had a 'free birth' at home. I don't know enough about it to comment really!

It would be needed for child benefit maybe?
It seems like she must have one for her son so likely she has one for her daughter too.

saraclara · 16/02/2026 18:33

If a child was in the full time care of a neglectful father, no one would question the mother taking legal action to get the child back in their care.

Bingo.

The only thing uncomfortable about this thread, is thinking about what that little girl is going through at the moment.

Tableforjoan · 16/02/2026 18:34

Breadcrumbtrail · 16/02/2026 18:32

It would be needed for child benefit maybe?
It seems like she must have one for her son so likely she has one for her daughter too.

£17.25 a week for a second born. Her first sounds like she gets dla and she works weekends, dad pays privately. Not a huge loss to have full control if you’re in the tinfoil hat brigade.

Breadcrumbtrail · 16/02/2026 18:46

saraclara · 16/02/2026 18:33

If a child was in the full time care of a neglectful father, no one would question the mother taking legal action to get the child back in their care.

Bingo.

The only thing uncomfortable about this thread, is thinking about what that little girl is going through at the moment.

I think it’s uncomfortable thinking about what everyone is going through.

Breadcrumbtrail · 16/02/2026 18:47

Tableforjoan · 16/02/2026 18:34

£17.25 a week for a second born. Her first sounds like she gets dla and she works weekends, dad pays privately. Not a huge loss to have full control if you’re in the tinfoil hat brigade.

Edited

This is all supposition and I think it unneccessary. The dad will either know already or find out.

saraclara · 16/02/2026 18:48

Breadcrumbtrail · 16/02/2026 18:46

I think it’s uncomfortable thinking about what everyone is going through.

True. But the little girl is the one without agency, and who, due to her age, is being socially, psychologically and developmentally damaged.

Breadcrumbtrail · 16/02/2026 18:50

Yes. And the young boy?

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