Accused of child abusing?

Your friend should have his lawyer get copies of all the voicemails & call logs from the kids, with the parents' permission, of course. A statement from each of them would also be helpful. Not only can this be taken to the judge to show a history of abuse (the mother's) and lying to ask for a lack of custody, but can also be used to sue her civilly for defemation. Your friend NEEDS to call his attorney.