We've had to counsel my daughter (who is extremely passive) to be very assertive to her step sister who is extremely dominant, and probably 3 times as strong physically. It has come to the point of physical confrontation where the stronger one was preventing the weaker one from leaving a place... The stronger one is trying to control my daughter's behaviour, and it's usually because my daughter is trying to do something she thinks is unfair and she doesn't want to let her get away with it. My daughter is pretty agreeable, but when confronted with dominant behavior retaliates passive-aggressively, which naturally makes things worse. Unfortunately the stronger daughter always feels like she's the one getting blamed because her behaviours are the ones that are more egregious and easy-to-see. We've told my daughter that she should use her voice more often. She very occasionally rises to the challenge of calling her step-sister out on her BS. We've also made it clear to my step-daughter that it's not ok to physically restrain someone from going somewhere. While I have seen this behaviour as bullying, it really IS typical sibling behaviour... I've seen way worse in my own family. When you say the 12-year-old is hurting him, what exactly are the complaints? I'm not trying to dismiss your concern, but I know from my own experience (You would not believe how angry I have felt toward my step-daughter... before accepting that she is just another kid and that she's very different from my own kid, and that she's responding like a normal kid with her predispositions) I do feel sad for my daughter, having to fight this fight with her step-sis, however they play well together 90% of the time, and if she wasn't learning this lesson from her step-sis, she'd be learning it the hard way, like I did, in school, where I was bullied constantly
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