Please or to access all these features

AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Conflicted after DS hit DD and she fought back and beat him up?

642 replies

ForAmpleRobin · 13/03/2026 18:39

Bit of sibling drama today and I’m not sure if I’m handling it right.

My DD is 9 and my DS is 11. Lately there’s been a bit of tension because she’s actually stronger and faster than him at a lot of things like running and general physical things. DD and my niece have started doing cross country and the girls have been practicing whilst we’ve been out on family walks as well as racing each other. DS is quite competitive and I think it bothers him more than he lets on that DD and his cousin are faster and stronger than him.

They were messing around earlier in the garden doing races and silly “strength competitions” like who can get who on the ground first and DS got increasingly annoyed when DD and DN kept winning. It escalated into him hitting his sister and trying to subdue her but she fought back.
She ended up properly beating him up. DN quickly came and told me about it and then I had to carry him inside and DH took DN home. He is covered in cuts and his bruises are starting to show up.

Obviously I’ve told them that hitting isn’t acceptable, but if I’m being completely honest I also felt proud that she’s confident and doesn’t back down. At the same time I know DS is feeling humiliated by being beaten up by his younger sister and that DN will spread it to the rest of the family. However this would help him learn his lesson!

AIBU for feeling conflicted about this? How would you handle it with both of them? I feel like I don’t know what the best punishment would be? I was thinking of grounding them both for fighting but then DD was in self defence so is it unfair and shall I just ground DS?

OP posts:
Thepinkdiaries · 14/03/2026 10:04

TigTails · 14/03/2026 09:53

I think it’s reflective of the real world tbh. Women of all ages are sick of male shit and him being smacked back serves him right. A little bit of shame will do him no harm either.

Actually this is a complete load of bollocks.

Don't put adult issues onto young kids.

Op should be teaching her children that there are far more important qualities than who’s the fastest or the strongest. She should be teaching her kids that everyone is different shapes and sizes and about kindness and bravery and showing respect.

She should also be nipping in the bud ant silly
play fighting, because it always escalates and ends up with tears and injuries.

MauvePombear · 14/03/2026 09:59

TigTails · 14/03/2026 09:53

I think it’s reflective of the real world tbh. Women of all ages are sick of male shit and him being smacked back serves him right. A little bit of shame will do him no harm either.

No. Violence is wrong full stop

Dinosweetpea · 14/03/2026 09:57

Isthateveryonethen · 13/03/2026 18:48

Would you feel proud if it was him that beat her? As a mother what a weirdo you are for even thinking like that.
he was wrong but she was far worse, because the time will come when he will do the same. You need to give them both a consequence but hers far more serious

This! There's a difference between lashing out (still not ok) and beating the crap into someone. Your daughter sounds like she needs help and absolutely the same (if not greater) consequences. Feeling proud of her is pretty shitty of you.

amusedbush · 14/03/2026 09:56

I generally tend toward "fuck around and find out" but the "find out" part needs to be proportionate. If he had hit her and she slapped him back, fine - that might have taught him to keep his hands to himself.

However, your DD completely lost control and took it way too far. Rather than feeling proud of her, you need to spell out that physical violence can result in serious, life-changing injuries.

Since she enjoys sport, maybe a martial arts class might teach her to regulate her temper.

theresbeautyinwindysun · 14/03/2026 09:55

I am so shocked that ANYONE would answer this thread without horror at the horrendous behaviour of any child attacking any other child to the extent they needed carried into the house! Your children sound aggressive and out of control, I don’t care their sex.

TigTails · 14/03/2026 09:53

NotMajorTom · 14/03/2026 09:51

Ffs

this response is all that is wrong with this thread

I think it’s reflective of the real world tbh. Women of all ages are sick of male shit and him being smacked back serves him right. A little bit of shame will do him no harm either.

NotMajorTom · 14/03/2026 09:51

MrsVBS · 14/03/2026 09:27

Nip in the bud now your son thinking he can use his hands when he doesn’t get his own way otherwise he’ll come up against people who aren’t his sister and will give him more than he bargained for, and good on your daughter sticking up for herself. Hopefully your niece telling everyone will make him think twice. At 11 if he does this at school or out and about he’s going to get a big shock.

Ffs

this response is all that is wrong with this thread

Sunshineandgrapefruit · 14/03/2026 09:50

They both crossed a line. Tell ds he shouldn't hit anyone but especially not girls or women and certainly not anyone younger and smaller than him. Tell him he deserved to get hit back and should learn a lesson. Tell DD you are glad she can defend herself but that she shouldn't hit, unless she's in danger, and that although her brother was annoying that wasn't the way to deal with it. Point out in a few years it could have ended a lot differently and you won't tolerate fighting in the house. Then take away both of their screen time for the whole weekend and get them helping around the house.

Bunnycat101 · 14/03/2026 09:49

This is outrageous on so many levels. You really need to review your entire approach to parenting. You son hitting your daughter is awful and needs punishing but your daughter also sounds completely feral if she assaulted him to the extent he was covered in scratches and bruises. As for taking away both their phones, why does the 9 year old have a phone in the first place?

Thepinkdiaries · 14/03/2026 09:48

TheFormidableMrsC · 14/03/2026 09:45

Good grief, I can’t believe you think any of this is OK.

It’s mental isn’t it. And to think some posters are encouraging it.

It’s sad to think that there are children who have to grow up with such ineffective parents.

All children should be able to live safely from violence and that includes sibling violence.

TheFormidableMrsC · 14/03/2026 09:45

Good grief, I can’t believe you think any of this is OK.

WheretheFishesareFrightening · 14/03/2026 09:37

I’d suggest your son has had his punishment, so I’d be giving him a telling off for starting it and not cancelling his birthday.

What your daughter did was much worse. Beating a sibling so they have cuts and bruises and can’t walk is unacceptable. One hard swift punch back would have been commensurate, she can’t just launch into battering people even if they start it.

Mercurysinretrograde · 14/03/2026 09:36

He deserved to be hit by her but it sounds like she didn’t hit him in self defence (ie to stop him), it sounds like she assaulted him. Is there something else going on here? Jealousy or long term resentment? I would punish both quite harshly. Him for being dumb enough to start a physical fight and her for a complete failure to understand what an appropriate response looks like. They are both old enough to know better.

likelysuspect · 14/03/2026 09:29

BeardieWeirdie · 14/03/2026 08:53

Play stupid games, win stupid prizes. I tell my daughter that if any little scrote in school hits her (which has happened and telling the teacher did bugger all) that she is to hit him back as hard as she can, preferably in the balls. I’ve told the school that I will not accept her being in trouble if she has to defend herself in future.
It’s time to hammer home to your mini Andrew Tate that hitting girls is unacceptable. I hope he’s learned a lesson.

Edited

Oh right on cue, nice one.

Blondeshavemorefun · 14/03/2026 09:29

So DS hit dd as she was beating him at games and she defended her self - but went a little too far

what would your brother /sister said if DS hit your niece instead of sister

both are wrong tho it may make DS stop and think a bit

so she’s 9 and he’s basically 12 next week - he will remember this and hope he won’t hold a grudge and beat her worse another day in years to come

you def Need to stop this now

when you say had to carry DS in - why couldn’t he walk / or you didn’t actually mean you carried an almost 12yr in / but helped him in

both need punishing. Both need to say sorry

don’t cancel birthday trip

going to school with bruises etc Monday will also be embarrassing for him if he says what happens

MrsVBS · 14/03/2026 09:27

Nip in the bud now your son thinking he can use his hands when he doesn’t get his own way otherwise he’ll come up against people who aren’t his sister and will give him more than he bargained for, and good on your daughter sticking up for herself. Hopefully your niece telling everyone will make him think twice. At 11 if he does this at school or out and about he’s going to get a big shock.

HappyMeal564 · 14/03/2026 09:27

Punish him for hitting her and punish her for covering him in cuts and bruises. Yes she should defend herself but not by beating her brother to a pulp. He needs to learn not to hit in anger and she needs to learn appropriate self defence, a slap if someone slaps you or beating someone up when they are really trying to harm you and you cannot get away. School will want to know about the cuts and bruises and how they happened

brunettemic · 14/03/2026 09:26

Sadly so many answers here seem to think because the massive overreaction was by a female on a male it’s fine. The DS doing what he did is objectively wrong and utterly unacceptable. For the DD to render him unable to walk and covered in cuts and bruises is the same. That is NOT self defence.

TheignT · 14/03/2026 09:21

ForAmpleRobin · 13/03/2026 19:07

I don’t think it’s necessarily bad to have a bit of harmless playfighting for kids? (Unless it leads to this situation)

I don’t know why she’s stronger, yes there’s an almost 3 year gap but people’s bodies are different. He’s slim and taller but she’s stockier I don’t know what more I can say?

In terms of the birthday DH doesn’t think I should cancel it so I’ll reconsider.

Edited

You sound like it's just up to you, maybe his father will just take him regardless if he thinks that's right.

Chattanoogachoo · 14/03/2026 09:18

Physical violence against each other is something which should have been left behind when they were toddlers.Would a disciplined sport help both of them?
Please don't feel any pride that your daughter beat her brother up.
Were you not at all concerned that your son's school would report his injuries, it's really worrying if they didn't/ don't.

diddl · 14/03/2026 09:16

So now I have realised what the "game" was-does that mean that he was being bullied & couldn't walk away when he'd had enough though?

Either way his sister either went way over the top "defending" herself or just out & out beat him up.

Thepinkdiaries · 14/03/2026 09:04

You’ll get a lot of boy hating comments on mumsnet telling you he deserved it.

But honestly op, this is disgusting behaviour from both your children and it needs nipping in the bud NOW.

You sound gleeful that your daughter really hurt your son. It won’t be long until your son grows up and if you don’t stop them fighting someone will end up injured. You shouldn’t be proud of your daughter for hurting your son.

You should be warning them to stop fighting or there’ll be consequences. I was never allowed to physically fight with my siblings and I’ve managed to function perfectly well as an adult without resorting to violence.

RvLl · 14/03/2026 09:03

MauvePombear · 14/03/2026 08:57

But it's ok that his sister battered him? Perhaps the answer should be violence isn't acceptable full stop.

Beardie, you presumably do realise that if your dd assaults someone at school, she could face severe consequences - expulsion/police etc. They don’t care about provocation, you cannot just use violence in that way.

sittingonabeach · 14/03/2026 09:01

@BeardieWeirdie they were playing a stupid game in the first place where the girls were throwing the weaker child to the ground. It’s quite possible she had hit him first (or he thought she had hit him)

OP has encouraged/allowed play fighting between the 2 different sexes siblings. So he has been getting mixed messages. Boys don’t hit girls unless it is your sister.

They are too old to be playing games like that

RvLl · 14/03/2026 09:00

Calm your pride in her defending herself because it’s unwarranted.

  1. when she is an adult, it’s likely that more than 97% of men will be able to overpower her. Men are hugely stronger. Fighting them is idiotic. Protecting yourself as an adult female comes down more to being careful than physical scrapping. I say that as a 6ft very well built strong tank of a woman. I am under no illusions that the vast majority of men could easily take me down. My size is a minor deterrent and my size lets me pass for a man if it’s dark and my hair is hidden. But in a physical fight, it’s useless and I’ll be overpowered easily.

  2. she is not in a “girl power” situation with her brother. They were engaged in childish competitions that played to her strengths and things she’d trained for. They had a childish fight which she took way too far if she ended up properly beating him up.

also the cognitive difference between them is likely smaller than the age gap with a boy/girl that way round at those ages.

they both need to behave themselves and control themselves.

especially because once he’s into/through puberty, if she tries to beat him up again and he fights back, he’ll annihilate her.