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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To tell my sister I don’t want to see her anymore if she doesn’t discipline my nephew for biting me?

1000 replies

IGrewUpInTheFallOut · 30/11/2025 19:21

My sister is a single mum to two children - my nephew, who is 14, and my niece, who is 13. My nephew has autism and her husband left when he realised how tough things would be.

I’ve just got back from a weekend of babysitting for her which has been a bit of a nightmare. My nephew used to be quite violent and angry, but my sister put him into kickboxing when he was 7 and he’s flourished, and it has really helped him regulate himself.

When I arrived yesterday, she warned me that he was quite overstimulated and that I just needed to follow the basic routine (get him to bed at a reasonable hour). I left him to his own devices until I went into his room at about 10:30 and asked him to put his iPad down and go to sleep.

He immediately grabbed hold of me and bit my arm, it must have been about twenty seconds before he let go. He was screaming at me to leave his room by that point, so I did, and went downstairs. I told my sister when she got home today, and she said she would have a word with him.

I’ve just got home and seen how bad it is (I’ve attached a picture). I sent it to her and asked how she had dealt with it and she said she asked him, but he said he felt overwhelmed and didn’t want to go to sleep, so he lashed out. She says that in her mind, that’s the end of it and she won’t be pushing it further as he can’t help feeling overwhelmed.

I’ve said in that instance I don’t feel comfortable being around him again and I won’t attend family Christmas. Now she and my mum are telling me that I’m selfish and I will ruin the Christmas period for everyone if I don’t come.

AIBU to draw this line in the sand?

To tell my sister I don’t want to see her anymore if she doesn’t discipline my nephew for biting me?
OP posts:
IGrewUpInTheFallOut · 30/11/2025 20:11

PumpkinTwistyWindToots · 30/11/2025 20:10

Are you fucking serious? You think police would charge an autistic 14 year old for biting his aunt? You're on another planet.

As I’ve said, he has capacity. Yes I do think the police would take action against an assault!

OP posts:
Gwenhwyfar · 30/11/2025 20:11

WhamBamThankU · 30/11/2025 20:10

It’s not obvious with SEN children Confused

Then the mother should have said so!!!

Balloonhearts · 30/11/2025 20:11

I would want him disciplined for that, too. I'd punish mine for it, overstimulated or not. That Ipad would be history. I wouldn't do Christmas with them either, fuck that for a lark.

Thankfully neither of mine bite, 3 year old is hard work as very rigid in her little routines but would never let her get away with that. Older one just slopes off with headphones if it gets too much for him.

My third bit me once as a toddler and I was so shocked that I slapped him upside the head and called him by our horses name. ( Usually the only bitey fuckers around me are ponies so I reacted on instinct and swatted at him.) He was so surprised he let go, started laughing and then couldn't remember what he was tantrumming over. Never did it again though.

FullOfLemons · 30/11/2025 20:11

You should put your safety first and so YANBU for not attending the family Christmas. I took a similar decision some years ago as I will not tolerate violence.

However it up to your sister to parent her child and YABU for telling her what to do.

Mamma1355 · 30/11/2025 20:11

IGrewUpInTheFallOut · 30/11/2025 19:38

A restriction on screen time or kickboxing at a minimum, she took him to his favourite place today and I feel like it’s just reinforcing that his behaviour is acceptable

That kind of punishment doesn’t work. They don’t make the link between action and consequence. Presumably screen time and martial arts helps him regulate, so taking them away will only make things worse. A punishment will have no bearing on whether he becomes overwhelmed again.

I am extremely sympathetic though as the parent of a biter. It’s really hard to manage apart from removing triggers. It is amazing that your nephew has found a positive outlet for his aggression and there haven’t been incidents in a long time. It sounds like it could be a one-off and she is trying not to escalate it or put too much attention on it.

IGrewUpInTheFallOut · 30/11/2025 20:11

MNOP · 30/11/2025 20:10

I thought he was nearly the same height as you. Now he’s 2” taller?!

That is nearly the same height as me?

OP posts:
nomas · 30/11/2025 20:11

PumpkinTwistyWindToots · 30/11/2025 20:10

Are you fucking serious? You think police would charge an autistic 14 year old for biting his aunt? You're on another planet.

Why are you attacking, OP? She’s not the one who has attacked anyone or accepted anyone being attacked.

IPM · 30/11/2025 20:12

FlyingApple · 30/11/2025 20:09

Well that's deeply unfair of her. You're not ruining Christmas because you don't want to be harmed.

But if the OP's sister stops a bit of screen time, the OP will go to the family Christmas.

So it's got nothing to do with not wanting to be harmed, unless she truly believes it's going to stop his behaviour completely?

RudolphTheReindeer · 30/11/2025 20:12

IGrewUpInTheFallOut · 30/11/2025 20:05

I don’t know if he always bites but he can get incredibly angry. Throwing things, shouting, swearing, slamming doors. There always seems to be an excuse for it though

Yes, it's called being dysregulated. It's common in autistic people when overwhelmed. I get the feeling you think kick-boxing and attending mainstream somehow means he's not autistic anymore. It can take a very very long time (if ever) for neurodivergent children to learn to regulate and he's a hormonal teen on top. Most parents of neurodivergent children know how and when to address such challenges. It's best to address what causes the overwhelm in the first place so it doesn't happen rather than simply punishing after.

Heronwatcher · 30/11/2025 20:12

Sorry I think you are being U.

I would definitely not be babysitting on your own again but I think you would be overreacting not to go to a family Christmas where your sister, mum and other members of the family will be there and can help you/ him. I totally understand why you’re upset but I’d give it a few days to cool down before you make a final decision.

Gwenhwyfar · 30/11/2025 20:12

nomas · 30/11/2025 20:11

Why are you attacking, OP? She’s not the one who has attacked anyone or accepted anyone being attacked.

There's a lot of victim blaming on this thread.

pikkumyy77 · 30/11/2025 20:12

GoingForAGallop · 30/11/2025 20:00

I think you need to trust Mum’s judgement on how to deal with her son, she is the expert.

Autistic children thrive on routine and having a different person putting them to bed would be extremely unsettling. I don’t think you should babysit again if you don’t empathize with the difficulties faced. The injury looks very minor, but you seem hell bent on expecting the child to be punished in revenge. Do you not understand that autism is a communication difficulty and this was the child’s way of expressing their upset at the situation. Mum dealt with it well by speaking to him about it. You’ve handled the situation badly, sulking and acting childishly.

Good God! If the 14 year old was that likely to be dysregulated the mother should have prepped both her son and the sitter with strict rules for engagement. How is this OP’s fault?

Arghhhhggggggggggg · 30/11/2025 20:12

IGrewUpInTheFallOut · 30/11/2025 19:58

You’ve summed it up. Not only am I physically hurt and shaken up, but I just feel like it’s another twist of the knife that she seems to think this is all okay, because I asked him to go to bed and he wasn’t ready. If he could explain that to her today, why couldn’t he say it last night?

I get it, I'd be really hurt if my family were reacting like this if I'd been physically assaulted. She probably isn't thinking about how you feel in all of this tbh, she will just be focused on her son won't she ( I'm not saying that's okay )

It's probably easier for her to place the blame on your reaction than to be honest with herself and say she's got a problem parenting him.

Your not wrong OP but I don't think there's anything you can do at this point. Do you have a partner who can support you right now?

I also don't think he was out of control last night tbh, with how tall you say he is and how much training he has, he could of hurt you even worse last night, the fact he didn't shows that he had some self control in the whole situation

Bananaandmangosmoothie · 30/11/2025 20:13

It really depends on his capacity. Is he capable of writing you an apology letter? If so then I think he should.

nomas · 30/11/2025 20:13

IPM · 30/11/2025 20:12

But if the OP's sister stops a bit of screen time, the OP will go to the family Christmas.

So it's got nothing to do with not wanting to be harmed, unless she truly believes it's going to stop his behaviour completely?

Why do you keep ignoring OP’s perfectly reasonable rationale and keep beating this point to death?

HighlyUnusual · 30/11/2025 20:13

The other things you say about him shouting, banging doors, being prepared to bite his own aunt, this is all deeply concerning. He is able to function in mainstream school and may well get a girlfriend soon. Is she going to just have to suck this up? Abuse by children against parents is only just being recognised, and as always, it's adolescent men with strength (gained by martial arts as well) against more vulnerable women. His poor sister.

It does not sound like a case where he's so disabled that he requires holding/restraining as with some people whose autism manifests more severely and in those instances, pretty much all the people around them have training in how to do that safely- and sometimes the parents do get attacked in their own homes too. In my experience, parents with children of this severity do not ask relatives to babysit for this exact reason!

Him going to a favourite place today- they are enabling him to behave without consequences. Frightening. He's not a small child and if in a criminal setting would not be treated like one either.

SpidersAreShitheads · 30/11/2025 20:13

I just wrote out a long reply and deleted it because it's clearly pointless as I see you've just said this "If he could explain that to her today, why couldn’t he say it last night?" - that says everything I need to know. Autistic people can't communicate during a meltdown, that's literally the point. That's why he couldn't describe it last night.

You clearly know very little about autism.

You aren't in the wrong for not wanting to babysit again.
You aren't in the wrong for feeling upset that he's bitten your arm.
You aren't in the wrong for asking your sister to address the subject with him.

You do seem to be dramatically overblowing events though while simultaneously refusing to accept the difficulties that come with autism.

You've admitted Christmas isn't actually about your safety, it's about you feeling "valued".

If you don't want to go over at Christmas, then don't. You are entitled to draw your own line in the sand regardless of what anyone else thinks.

Your sister has got enough on her plate. Parenting an autistic child is tough and there are lots of challenges along the way. It's fine for you to feel as if you don't want to be part of providing extended family support - it's not for everyone.

IPM · 30/11/2025 20:14

IGrewUpInTheFallOut · 30/11/2025 20:11

As I’ve said, he has capacity. Yes I do think the police would take action against an assault!

You think the police are going to take action against an autistic 14 year old for biting his aunt, because he didn't want to put his screen away at bedtime?

They're really really not.

IGrewUpInTheFallOut · 30/11/2025 20:14

IPM · 30/11/2025 20:12

But if the OP's sister stops a bit of screen time, the OP will go to the family Christmas.

So it's got nothing to do with not wanting to be harmed, unless she truly believes it's going to stop his behaviour completely?

If she took those actions I’d feel as though she takes the behaviour seriously and would be willing to step in if he attacked me at Christmas.

OP posts:
FlyingApple · 30/11/2025 20:14

IPM · 30/11/2025 20:12

But if the OP's sister stops a bit of screen time, the OP will go to the family Christmas.

So it's got nothing to do with not wanting to be harmed, unless she truly believes it's going to stop his behaviour completely?

I think the OP's problem is that without consequence then what's to stop it happening again? And if everyone is relatively ok with it, then OP can just be collateral.

In my opinion, I think going at Christmas would be fine as others are there but I can see why the OP is uneasy.

godmum56 · 30/11/2025 20:14

Arghhhhggggggggggg · 30/11/2025 20:12

I get it, I'd be really hurt if my family were reacting like this if I'd been physically assaulted. She probably isn't thinking about how you feel in all of this tbh, she will just be focused on her son won't she ( I'm not saying that's okay )

It's probably easier for her to place the blame on your reaction than to be honest with herself and say she's got a problem parenting him.

Your not wrong OP but I don't think there's anything you can do at this point. Do you have a partner who can support you right now?

I also don't think he was out of control last night tbh, with how tall you say he is and how much training he has, he could of hurt you even worse last night, the fact he didn't shows that he had some self control in the whole situation

yup and that says to me deliberate choice not meltdown or dysregulation.

nomas · 30/11/2025 20:14

Gwenhwyfar · 30/11/2025 20:12

There's a lot of victim blaming on this thread.

Truly depressing. If it was a man being attacked, there would be different responses.

Eviebeans · 30/11/2025 20:15

IGrewUpInTheFallOut · 30/11/2025 20:10

I think I’d rather do it at this point. My partner has extended an invitation to his family Christmas though and to be honest I’m considering it

What does your partner have to say about this situation? Does he spend time around your family? Why is he not going there for Christmas with you?

I’m looking at your name and wondering if there’s more to past family situations.

WhamBamThankU · 30/11/2025 20:15

Gwenhwyfar · 30/11/2025 20:11

Then the mother should have said so!!!

I agree with you! I said the mum should’ve been specific with times if it’s what may have contributed!

PumpkinTwistyWindToots · 30/11/2025 20:15

nomas · 30/11/2025 20:11

Why are you attacking, OP? She’s not the one who has attacked anyone or accepted anyone being attacked.

Because I think she's being ridiculous. It's a nasty thing that happened but the answer is don't look after him again and don't try to parent or discipline him. Not to avoid him and the rest of her family because he didn't say sorry hard enough.

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