For me this is a no brainer. The husband is dangerous and is in desperate need of counceling. His reactions, his mannerisms and his eyes seem to show a seething anger that is about to blow and will result in harm to his X wife as well as his children.
The mother in law, on the other hand, needs to back off and out. She is a loose a canon verbally and needs to shut her mouth. No wonder the daugher and mother of those precious children seems so quiet. She can't get a word in. I happen to agree with her that she should have full custody without shared visitation to the husband until he goes through an attitude adjustment via counceling and a change of heart and can prove he is stable and not a threat to his family.
I would have loved to meet his parents and know of how he was raised. Something is wrong with him but I believe, inspite of the male attorneys opinion on her qualifications as mother based on one statement and ignoring all other evidence that she is a sane, stable, loving and caring parent.