As the H of a WAS whose father left her family when she was 10 (he was definitely MLC! Her brother was 6 at the time), had almost no contact with her and the little she did was almost always "bad" (he did awful things, never paid Child support, drug the divorce out 10 years so the kids would be of age and he could keep as much money away from exW as possible, put his business in OW's name to keep out of divorce, married OW after divorce was final and didn't bother to even tell his daughter, her GF had to tell her, the list goes on)and now that she is having an MLC of her own, he has been "helping" her any way he can to get her to leave me and her kids. He is the only person who thinks she is doing the right thing, tells her that the only way to "grow" and be "happy' is on her own as being married will only hold her back (she is 47!).
This man NEVER got out of his MLC. He told her 7 years ago that he wanted to make up for all the bad he had done (after his father died)but only her, NOT her husband and kids as he felt she was wasting her life as a stay at home mother! My W has wanted his love and respect her whole life and could never get it. It hurt her, gave her trust issues, affected every part of her life. Now she see's a way to get that love but to get it, she has to do what HE did and in her MLC rattled mind it's her chance!
Sometimes it's better to keep the kids as far away from the MLCer as possible. We all want our kids to have a good relationship with both parents but I have seen the damage they can cause, damage that is now costing my W dearly! Be careful and I wish you the best.