A friend broke up with her emotionally abusive partner two years ago. They have two young dds and he continues to abuse her and her ds (not his) through them, telling the girls lies about their brother; court action is now happening because he's demanding residency. (He won't get it, his lies have been thoroughly investigated by police and social services. Women's Aid are involved.)
Friend has found her ex's ex-wife on FB, they've exchanged friendly messages and it's possible the exw will give a statement to the court about the way he abused her, physically in her case. He was permitted only supervised contact with their daughter, who is now a young woman, and he stopped seeing her quite quickly.
The ex has now remarried, and his abuse of my friend and her ds immediately and shockingly escalated, hence the court action. We can see his abusive behaviour now also being turned onto the new wife, his pattern starts with geographically isolating his partners and he's certainly achieved that. New W is still madly loved-up and of course cannot see what he's doing.
Her parents, however, are concerned about the speed with which the relationship has moved, and the fact that he has a reputation locally as a bit of a mouthy hothead; he's pissed off a local chap, well-liked, well-known and well-respected. Well, actually, he's pissed off a lot of people because he's Always Right, but this chap is known to the parents.
So, we have also found the NW's dad on FB. Do we contact him anonymously and say, look, your fears are well-grounded, this is what he did to exW, this is what he's doing to his exP, their dds? So he could talk to his dd, and she could at least keep her eyes out for the red flags.
Or, given that new W is an adult and not on her first marriage (apparently the last dh was a cunt too) do we just leave it, and maybe help pick up the pieces when he's fucked her over too?