LTRs kid is a problem child. I have my own child with my ex and a child with my LTR, LTR has a 9 year old boy. We do not live together, when we spend time together 3 days a week he stays with his grandparents or occasionally stays here with us. His behaviour is her fault he’s had substandard up bringing she was a young mother and had I not been a beta faggot when I met her I would never have gotten with a single mum. But that’s by the by now I did and we have a child together.

His father is semi present. He doesn’t pay towards his upbringing or have any meaningful role. (But I don’t pay for him either so that’s none of my business)

Other two kids are great, my 12 year old is bright and doing well in school. Our 2 year old is also bright and learning fast. This child is not bright he’s behind in school and misbehaves every chance he gets. He hits the baby. when I’m there he’s good as gold but when he’s with his mum he is a nightmare.

My question is this: how much responsibility for this should i assume. My own kids are fed and taken care of which is my priority over anything. I knew she had a kid when I met her so I’m not complaining I just want to know what the opinion is wether I should be trying to discipline him or I should just leave it to her as it’s not affecting my own children. Granted I do feel for him but it is not my priority.