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