Some abusers do worse than isolate their victims, they manage to get others on side supporting their abuse. In romantic relationships it might take the form of acting charming and winning over the family with public displays of affection so that when the partner expresses concern about problems their own family dismiss them. In parent/child relationships it can take the form of treating one child as a scapegoat so the whole family learn to treat them differently - a lot of the stories in the caretaking forum have people with extended families all presuring them to stay in abusive caretaking relationships while they offer nothing but criticism and blame the caretaker for being “selfish” if they ask for any support. Escaping abuse from one person is hard enough, when your entire family joins in it would be near impossible ☹️