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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

AIBU to worry about my stepson's aggression towards the younger children?

89 replies

Wafflecakes · 23/09/2026 18:47

I’m not sure how to deal with this? My stepson is 7, almost 8. He lives with his mum and stays with us every other weekend. We have a blended family, I have 2 children from a previous relationship and we have a child together. My partners son has over the last few years become very aggressive, always fighting and lashing out. He seems to be able to manage who he lashes out at as he doesn’t go for my son who is older but will go for my daughter who is 9. He’s started threatening and pushing over my 3 year old daughter. He doesn’t have ASD or anything, but always seems miserable and angry. My partners son instantly will shift blame and say they shouldn’t wind him up but they aren’t doing anything out of the ordinary for children their ages. He is the one who comes in the house calling my daughter fat etc. I’ve told my partner he needs to take him for some help as the behaviour isn’t normal ( he does this at both homes, at school, at football) and how a boy his age certainly should know better than to hit girls especially a 3 year old. Is this typical behaviour? How do I approach this? My partner instantly shifts blame to try and explain the behaviour unless it’s witnessed infront of multiple adults then he will discipline him. Any advice please as I’m anxious with the build up to every other weekend, I don’t want his son to feel unwelcome but equally I don’t relax and i am scared to leave my child in the room with him. Prior to the aggressive behaviour he was a very quiet, clingy child. He has been in trouble at school for bullying on a few occasions but nothing else is being done to see what’s causing this behaviour

OP posts:
GreenCaterpillarOnALeaf · 23/09/2026 20:26

@Wafflecakes also, I know there’s lots of people saying blended family’s never work, but they can. It’s more hard work for sure especially when the kids are teens and there’s gonna be rough patches - but my parents both remarried and had blended families and it worked out. I know a few blended families now as an adult and I will say they range in how successful they are, but it can work. You’ve got your work cut out I won’t lie, but if you all put your heads together and communicate I’m sure it will be fine. I look back on my childhood and it was happy one, I am now and adult and love my step mum and step dad and I appreciate them and all they did for me and my siblings and I’m glad both my parents found happiness. Yes, the majority of blended families have their issues but if you work on it it can work. :)

Wafflecakes · 23/09/2026 20:27

ThisMauveTurtle · 23/09/2026 20:21

Your partner is a shit dad to all his kids.
He doesn't get a medal for bringing his child to football and booking a trip to Portugal with his son, while you are left at home with all the other kids.
He's having a great time for himself isn't he

I think he’s shit at discipline and consequences and just likes an easy life not upsetting anyone.
I wouldn’t say he’s a shit dad, he works hard, provides and spends all his free time with his children. He’s not superhuman and can’t split himself in 2. I don’t mind taking my daughter to her dancing whilst he covers football, I’d rather wait in the car with a book instead of a football field. But we are trying our best for all our kids, parenting is hard, the perfect child doesn’t exist just as the perfect parent doesn’t.
we took our daughter to Disneyland Paris midweek whilst the other kids were at school so she’s not missing out either.

OP posts:
Wafflecakes · 23/09/2026 20:28

GreenCaterpillarOnALeaf · 23/09/2026 20:26

@Wafflecakes also, I know there’s lots of people saying blended family’s never work, but they can. It’s more hard work for sure especially when the kids are teens and there’s gonna be rough patches - but my parents both remarried and had blended families and it worked out. I know a few blended families now as an adult and I will say they range in how successful they are, but it can work. You’ve got your work cut out I won’t lie, but if you all put your heads together and communicate I’m sure it will be fine. I look back on my childhood and it was happy one, I am now and adult and love my step mum and step dad and I appreciate them and all they did for me and my siblings and I’m glad both my parents found happiness. Yes, the majority of blended families have their issues but if you work on it it can work. :)

That’s lovely and so nice to hear. We are trying and hopefully we get through this difficult patch, I’m sure teenage years will bring a whole lot more drama!!

OP posts:
Odellio · 23/09/2026 20:32

Your DH needs to parent him everytime, not just when other adults witness the violence.

Your SS needs counselling, no ifs and buts from your DH.

If your DH doesn't engage with correcting his behaviour and helping his son. Then you'll have to do whatever necessary to protect your little DD. Visits at grandparents only, or living apart but together just to throw out a couple of options.

Edit to add: These things take time so in the short term, SS is never left alone with DD. Your DH has to supervise him 24/7. That'll be enough motivation to sort the root of the problem.

(From a fellow stepmum who is dealing with similar issues)

NopeNotThat · 23/09/2026 20:34

Initially I'd make a real point of taking all the other kids out and leaving dh and his son to it. Every single time, without fail. Seperate spaces entirely at home. Even of that means dh and dc share a room and you share woth the other kids.

Force DH to live with his choice until he can address it.

Fidgety31 · 23/09/2026 20:47

Your husband really should not have produced another child when he can’t look after the son he already has… but that’s too late now isn’t it !

I would bet your step son’s problems are a product of his environment, rather than any neurodiversity.

Poor boy probably confused as hell by all these step relatives and half sister and god knows who else in his life !
sounds like he is crying out for some stability .

OnTheBoardwalk · 23/09/2026 20:49

The poor SS is having a horrible time between his parents but you are doing nothing wrong and are doing the right thing protecting your daughter

i was older, about 10 when we nearly became a blended family. My brothers and I used to fight but it was nothing like the pain I got from my could be step brother

you shouldn’t have to take your children out of their safe environment to accommodate him

Loadsapandas · 23/09/2026 20:51

While your stepson has never lived in a nuclear family unit, he may now be more aware of what it means to him - he’s a bit of a floater between 2 very different houses.

that cannot be easy, and as a child he is acting out with poor behaviour because kids often cannot make sense of their world or emotions.

This isn’t your responsibility, but I think he needs therapy and as a parent I would be trying to get support to help in.

for you, I’d never leave my kids around him unsupervised.

YourLoftyCyanZebra · 23/09/2026 20:56

If your DD tells school about the abuse she is receiving at home your and you partner will have an awful lot of explaining to do. His overt misogynistic violence will not be tolerated over your younger children's welfare. They will be removed from your care if you cannot provide a safe home for them. Social services can and will leave you both with the violent teenager and remove the younger children.

arethereanyleftatall · 23/09/2026 20:56

Please tell us he’s taken his son to Disneyland Paris too…

Wafflecakes · 23/09/2026 21:06

No, his son got the option of which holiday he’d prefer to do and he chose the lads and dads football holiday where his teammates are going with their dads.
I am absolutely aware of this and that’s why I’ve put this in here seeking advice, I’ve had a discussion with my DH that if there is even a threat of violence he is to take him to his parents and stay there with him.
i am hoping he takes my advice to take him to see someone and maybe get to the bottom of this behaviour

OP posts:
FreudvsJung · 23/09/2026 21:12

I think you all need help. This isn’t just a child problem. He shouldn’t just be spent to therapy. With young children, the adults around them also need to be heavily involved in the therapeutic work/intervention. From his world, he doesn’t have much stability- it’s quite messy for him.

MorganKitten · 23/09/2026 21:29

He doesn’t seem to have stability, might be more aware of other family units and is showing this with lashing out, he needs care and support.

InWithPeaceOutWithStress · 23/09/2026 21:51

If your husband refuses to do anything about it you need to take him to therapy as his own issues are getting in the way of effective parenting

lunar1 · 24/09/2026 04:43

Only in a blended family can a child’s place in the home be threatened rather than any sort of stability or decent parenting happen.

Varnicka · 24/09/2026 12:49

You’re doing the right things OP.

I had the same issues with SS7. Since splitting with my ex, SS’s mum has opened up to me about him having serious behavioural issues in her home too. My ex did nothing to address it.

Obviously I’m sad the relationship ended for the sake of our shared child, but I’m not at all sad to not have to worry about her being hurt any time my back was turned anymore.

outerspacepotato · 24/09/2026 14:00

He sounds like he's got attachment issues and he's going after your girls in particular.

Safety first. He's physical with your youngest. Is he physical with your 9 year old too? He can't be left alone with your kids.

Does your husband give him consequences when he gets physical with your youngest? You say your husband spends the most time with this child. Your youngest barely sees him, so he's not really much of a parent to her.

Therapy. This is happening at school and at home. He needs help. But as an above poster said, are you all going to be able to participate in what family therapy requires? You have a very busy family.

If your kids are in danger, your husband needs to take his custody time elsewhere. Rent a small apartment, or move out altogether. I think your idea that he takes his custody time at his parents' place will work, at least to keep him safe.

I feel bad for him. He's grown up moving between households where nothing is stable and he's learned how to get attention for himself in negative ways and your husband is still taking him on the big trip rather than necessary therapy.

CallmePaul · 24/09/2026 14:07

Gentle parenting = shit parenting.

The little lad is obviously not doing well. The wishy washy bollox from both parents is certainly a contributing factor. Its only going to get worse. I wouldn't be letting him anywhere near your 3 yr old. He could really hurt them.

Mrschickenlady · 24/09/2026 14:35

Everyone agrees this is not normal or ok.

Sounds like all parents and step parents doing their best.

I’d recommend taking him to a clinical psychologist - they can take reports from school etc and help get to the bottom of the problem and recommend further therapy

PussInBin20 · 24/09/2026 15:43

He just needs clear boundaries / discipline which you say he doesn’t ever get. How is he ever going to learn what is right from wrong if no-one spells it out to him. This will only get worse if he is not taught now.

What are the consequences for him when he is aggressive to the girls? That’s what needs addressing.

ClaudiaNaughton · 24/09/2026 16:58

Maybe get some professional help to unwrap his feelings. Better than the Portugal week the two of them going on if you need to pay.

ChimpanzeeThatMonkeyNews · 24/09/2026 18:39

Makebelieveanotherlife · 23/09/2026 19:09

Absolutely agree. Selfish really

I’d never do it, personally.

Bearbookagainandagain · 24/09/2026 20:04

Wafflecakes · 23/09/2026 19:11

As I’d mentioned above, his mum and dad were never in a relationship so he has never known them as a family unit. His dad and I have been together 6 years and married for 2. He comes on every family holiday, trip, days out, he has plenty of 1-1 time with his dad, more than our daughter has with her dad as to accommodate his son. My husband works long hours and doesn’t see our daughter through the week as she is asleep when he gets home, and at nursery in the day. She also has dancing on the weekend and he watches his son at football the weekends he doesn’t have him.

You keep detailing the perspective of the parents when posters are trying to give you the perspective of the child.

This is not about the parents. What happened happened, they might be managing the situation as well as they can, and they might even be managing it well.

But it doesn't matter, it will still be a very difficult environment for an 8yo, and clearly he isn't doing well right now.

Q2C4 · 25/09/2026 06:52

Pinkbananaa · 23/09/2026 19:29

Surely this isnt new behaviour youve had six years together he doesnt like other kids especially kids that live with his dad. Regardless if he was a product of a one night stand you then decided to add another child into the mix with your additional two. So yes this was selfish behaviour.

Edited

Why is it selfish to have another child in this scenario? Should everyone stop at one child?!

Shatenoeuf · 25/09/2026 06:56

Children hate their parents separating. It causes massive trauma. Its even worse if parents then introduce stepparents & go off and live with that family.

Its so so shit for the kid, i understand why he is aggressive and resentful of your DC.

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