Quirky and Momz,
I've got my .22 ready to go!
Yes, the consensus on this board is good: go as a group to the mom and give her an ultimatum. Make her call on a cell phone right in front of all of you. If she refuses, tell her you will. She may need a safe house, as well. Find out about safe shelters around for abused women and children. Support her and reassure her that all of you are behind her in this and will do all you can to protect her if she will just be a mom and protect her child.