A man chest-bumping a pregnant woman is a weenie. She needs out because this kind of weenie doesn't see much problem with using his superior physical capacity to force his own interests, and unfortunately if he's as nuts as your'e saying, there's no way for her to even figure out how to predict what he wants at any given moment.

It doesn't much matter if he "signs" papers. Have her contact a local lawyer and have him served with papers, then depending upon the state, she needs to keep up with what the next step is in order to make sure it doesn't just disappear for lack of moving forward with it. He might decide not to do anything, which is easier for her but she has to do it ALL... or he might decide to fight it, which is a pain in the neck for her but at least she'll have a better chance of showing what a nutcase he is so that custody/visitation/child support issues will be resolved.

She's not goign to be allowed to finalize a divorce till the child is born, but there's no reason she can't get the process underway, so that maybe she can get him to pay temporary support, maintain medical insurance or whatever so that she and the baby will be fine in teh meantime.

Whatever life she left in order to be with him, though... she needs to expect to go back to IT and figure out how to make ends meet without much help from him, becasue child support for one baby is certainly not goign to support her plus the older kids.

Have her talk to a lawyer, asap, so that she will be protected from him as her pregnancy progresses.