oh to know the right answers!

so here I am asked to help out with a couple friends of ours who have decided to get divorced...well she left him 3 day beore Chrsitmas and has moved on VERY quickly if ya know what I mean...so needless to say I disagree with her decisions. Its not a real good situation really...kids are invloved and child protective services have been called(not by me) and one child now has been taken away. The father has asked us for guidance and expressed help in looking to GOD. So ofcourse I jump at that because its what were supposed to do right? he has been absent from living Gods way and worshiping him so I felt it was my duty to bring him back. Slowly but surely I believe it will happen. I have tried with the wife for over 5 years to get her on the right path. I have asked her to church, given her books from our resource table, offered advice, listened and offered much help. She has chosen not to change her ways and now has torn a family apart. She has accused me of not helping her at all. That I have abandoned her. How can this be? what else can I do? I still pray for her salvation, pray for her kids, pray that she make the right decisions, but I cant stand by her current ones. Its toxic to my own relationship and I dont want to come off as I approve of her shenanigans! Especially when her kids are being physically and emotionally hurt. I have been accused of not being a good christian friend. So whats the right thing to do then? I feel I have done what I can...what else can I do? if anyone has that one right answer I would love to know it because right now I feel at a loss. Anyone have bible versesI can pass on to the husband? Hes more open right now as she will no longer speak to me. I offered Matthew 5(?) sermon on the mount regarding anger for him. I also had him read Romans 16:17-18. It was a daily bible reading on my blogger and it seemed appropriate for him.
I have often in the past few days wondered why God asked me to do this...I feel very clueless and and wondering if im really helping at all....