Dealing with abusive parents - need advice, assalamu alaykum

assalamu alaykum - i need other perspectives because this is really upsetting me. i got into a heated discussion about parental rights. i know a family where the father physically harms his adult children - he strangles and punches them, even drawing blood. he’s controlling and terrifying. one of those children asked me for help, but my dad told me not to get involved. we argued because i told him what that man is doing is haram and the children are justified in moving out to protect themselves. my dad insists a father has undeniable rights in islam. i just can’t see how that makes sense. what bothers me is that so many talks and scholars emphasize how to treat parents, and i understand parents have a high status in islam and deserve respect and kindness. but where do we draw the line? why don’t we hear clear guidance about setting healthy boundaries with parents while still upholding their rights? surely it can’t be that no matter how abusive a parent is, a child must endure it without protecting themselves? i once asked someone studying the deen about conflicts like this. i asked: what if parents force you into becoming a doctor and you really don’t want to? they said try to speak and reach an agreement. i asked what if they still insist - they said you must become a doctor or at least try your best. i know it’s not right for a muslim to dislike what Allah has decreed or to reject good counsel, but i struggle to understand how this is just or how it protects vulnerable people. has anyone else faced something similar? how do you balance honoring parents with safeguarding yourself and your family? any guidance or suggestions would be appreciated.