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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:
IPM · 30/11/2025 20:15

nomas · 30/11/2025 20:13

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

Because it's not a perfectly reasonable rationale in my opinion.

I would've thought that would be perfectly obvious to you?

IGrewUpInTheFallOut · 30/11/2025 20:15

FlyingApple · 30/11/2025 20:14

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.

My problem is that she is unwilling to take any action so who’s to say she would take action if she witnessed it first hand?

OP posts:
Arghhhhggggggggggg · 30/11/2025 20:16

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.

But he wasn't actually having a meltdown or he would of seriously hurt the OP. He's roughly the same size as her and has trained at kickboxing for 7 years. He was actually in really good control of himself hence the bite not being as severe as we would expect.

So no that wasn't an autistic meltdown that was a teenager bullying his auntie

nomas · 30/11/2025 20:16

IPM · 30/11/2025 20:15

Because it's not a perfectly reasonable rationale in my opinion.

I would've thought that would be perfectly obvious to you?

So why didn’t you respond to her when she explained her rationale?

Why keep bringing up the same point again and again to different posters?

SpidersAreShitheads · 30/11/2025 20:17

Arghhhhggggggggggg · 30/11/2025 20:16

But he wasn't actually having a meltdown or he would of seriously hurt the OP. He's roughly the same size as her and has trained at kickboxing for 7 years. He was actually in really good control of himself hence the bite not being as severe as we would expect.

So no that wasn't an autistic meltdown that was a teenager bullying his auntie

Respectfully, I disagree.

Changename12 · 30/11/2025 20:17

Namenamchange · 30/11/2025 19:45

Does screen time really regulate behaviour? It appears to regulate it in the moment, but when children need to come off, screens appears to escalate behaviour, this appears the same for lots of children, lots of ability and a wide age range.

Edited

my grandchildren’s behaviour and concentration improved radically since their parents decided to really limit their screen time. Too often it is used to occupy children.

PumpkinTwistyWindToots · 30/11/2025 20:17

Arghhhhggggggggggg · 30/11/2025 20:16

But he wasn't actually having a meltdown or he would of seriously hurt the OP. He's roughly the same size as her and has trained at kickboxing for 7 years. He was actually in really good control of himself hence the bite not being as severe as we would expect.

So no that wasn't an autistic meltdown that was a teenager bullying his auntie

That's quite an assumption

IPM · 30/11/2025 20:17

IGrewUpInTheFallOut · 30/11/2025 20:14

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.

And you think she's just going to continue tucking into her turkey, completely ignoring an attack on her sister by her son otherwise?

And your mum too?

Eviebeans · 30/11/2025 20:17

IGrewUpInTheFallOut · 30/11/2025 20:14

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.

Has he ever bitten or physically attacked you before

Mamma1355 · 30/11/2025 20:17

It’s sounds like you want your nephew to be disciplined so you feel valued - this isn’t a good reason to discipline a child and any kind of punishment is not going to be effective because it won’t stop him from doing it again when he is overwhelmed. Your sister has to address the root cause of the dysregulation.

Your feelings are absolutely valid through and I you shouldn’t feel guilt tripped into going to Christmas.

PumpkinTwistyWindToots · 30/11/2025 20:17

Changename12 · 30/11/2025 20:17

my grandchildren’s behaviour and concentration improved radically since their parents decided to really limit their screen time. Too often it is used to occupy children.

Are your grandchildren autistic?

IPM · 30/11/2025 20:18

nomas · 30/11/2025 20:16

So why didn’t you respond to her when she explained her rationale?

Why keep bringing up the same point again and again to different posters?

Because I want to.

And given your own posting style across many different threads on this forum, I would've thought you'd definitely understand that.

ohfook · 30/11/2025 20:19

IGrewUpInTheFallOut · 30/11/2025 19:44

But I don’t see why I should calm down. It’s been twenty four hours (ish) and I still feel the same way. He’s attacked me and I’m being labelled as the one in the wrong for not feeling comfortable being around him unless his behaviour is challenged

You’re conflating two separate issues. You either feel safe around him or you don’t. so you either need to say you’re comfortable being around him at Christmas or you aren’t and base your decision around that. Getting your sister to challenge or discipline him will, by the sounds of it, have no impact at all so she’d only be doing it to appease you - it wouldn’t make him any less likely to do it again. Practical steps that increase the possibility of him staying regulated are much more likely to ensure your safety that a random telling off for being dysregulated.

Your attitude isn’t unusual by the way, it’s just rooted in misunderstandings surrounding neurodiversity and this persistent belief that not telling them off is ‘doing nothing’ or letting them get away with it.

IGrewUpInTheFallOut · 30/11/2025 20:20

IPM · 30/11/2025 20:17

And you think she's just going to continue tucking into her turkey, completely ignoring an attack on her sister by her son otherwise?

And your mum too?

Well I don’t know. To her it’s clearly not a big deal so who knows

OP posts:
Bitzee · 30/11/2025 20:20

OP if you don’t feel safe or you feel like your sister only values you for free babysitting (based on your updates it sounds like that might be the case) then honestly screw them and go with your partner to his parents!!

Just stop with the ultimatums and trying to dictate how your sister parents. Maybe there’s something in her approach that you don’t understand or maybe she is doing a crappy job with discipline, IDK, but you’re not going to change it and nor should you be trying. All you can do is decide where you draw your own boundaries.

Hendersso · 30/11/2025 20:20

Does he behave towards his mum like this? If so this may be why she is under reacting as it’s probably common for her to get hurt too? No it’s definitely not ok but he is autistic but it sounds like he knows what he can and can’t get away if he is at mainstream school. Was it because you entered his room and mum was out I.e - change in routine? No one can tell what the right thing to do is as no one on here knows him. I wouldn’t babysit but it does sound like your sister needs support. I would still attend Christmas I think.

Arghhhhggggggggggg · 30/11/2025 20:20

PumpkinTwistyWindToots · 30/11/2025 20:17

That's quite an assumption

It's no different to the posters assuming he couldnt control himself yet he knew when to stop biting didn't he.

I'm autistic and so is my daughter, autistic children can still have temper tantrums like neurological children, not every outburst is a meltdown. Some of it is just typical kid behaviour. Hence him not drawing blood like many asd bites do

Pollqueen · 30/11/2025 20:20

He's 14 so should know not to bite and I wouldn't be babysitting again, that's for sure. All those leaping to defend him, he will be an adult male soon. Will you be as sympathetic when he's treating future partners the same way?

Wambamaloomaawambamboo · 30/11/2025 20:20

IGrewUpInTheFallOut · 30/11/2025 19:55

Maybe I am very silly, but maybe as a 5 foot 4 woman having a 5 foot 6 teenager who has been training regularly for the last seven years grab hold of me and not let go despite me begging him to has really shaken me up and I don’t particularly want to be around him or anyone who defends it at the moment

I thought he was 'nearly the same size as you? Now he's taller than you?

IPM · 30/11/2025 20:20

IGrewUpInTheFallOut · 30/11/2025 20:20

Well I don’t know. To her it’s clearly not a big deal so who knows

Of course you know.

Don't be so ridiculous.

IGrewUpInTheFallOut · 30/11/2025 20:21

Wambamaloomaawambamboo · 30/11/2025 20:20

I thought he was 'nearly the same size as you? Now he's taller than you?

He is nearly the same size as me. He’s only a couple of inches taller - that’s nearly the same size (well, height. He’s a lot more muscular than I am)

OP posts:
godmum56 · 30/11/2025 20:21

SpidersAreShitheads · 30/11/2025 20:17

Respectfully, I disagree.

except that people who do know about autism and dysregulation have pointed out that if he had genuinely lost control, the bite would have been a lot worse which is my (way less experienced) experience too.

BaronessEllarawrosaurus · 30/11/2025 20:21

SpidersAreShitheads · 30/11/2025 20:17

Respectfully, I disagree.

I disagree too, I know how my own child behaves when in meltdown, they know it's wrong so keep a level of control but still can't fully stop themselves.

Lookingforthejoy · 30/11/2025 20:21

tripleginandtonic · 30/11/2025 20:08

At 14 that's not a defence.

Defence? This isn’t a law court.

For many autistic children this is fact.

Arghhhhggggggggggg · 30/11/2025 20:21

godmum56 · 30/11/2025 20:21

except that people who do know about autism and dysregulation have pointed out that if he had genuinely lost control, the bite would have been a lot worse which is my (way less experienced) experience too.

People don't want to listen to reason they just want to tell the OP she's unreasonable when she's really not

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