Especially if they are close family I would be even more harsh about it. If my family f*ks this much with my borders, I am so getting rid of toxic assholes. I ab-so-f*ing-lute-ly not care about blood relations, when it comes to people ignoring boundaries.

I - for example - ditched every contact to my aunt after she accused my SO of being just a gold digger. At my dad's (her brother's) funeral. So no - I don't care for blood. I care for being a decent human being and treating everybody with the respect they deserve, as long as the reciprocate. If not, I treat them with the interpersonal equivalent of a killfile.