I'm NC with my brother because he is a vile, abusive human being. He is getting married this Summer for the second time. His fiancee has three young daughters.
He cheated on his first wife - with ordinary women and with prostitutes - and blamed her for it, telling her that it was because she wasn't attractive enough. He sometimes went on drinking binges lasting several days, ending up in hospital many times with alcohol poisoning. Since splitting with his ex, he has harassed and threatened her, let his kids down by not turning up at birthdays and Christmas, and just generally been a total arsehole.
His fiancee has no idea about any of this. Since he met her, he has been in one of his 'dry' patches and has not been drinking (although he has not been through treatment/rehab/AA or anything - he does this from time to time, to prove that he can cure himself of alcoholism). So this woman thinks that she is marrying a moderate, gentle, faithful man whose evil sister doesn't speak to him with no good reason.
I don't know this woman and have never met her but I spend a lot of time wishing that I could warn her about him.
What would you do?