My situation with my WAW....

[MrBond]

"Yes it's mostly 50/50, but that's a lot less than what I'm used to"

So are you trying to get primary custody? It sounds like she's trying to get primary.

I would ask your MIL what other traumas there were. They could also help in getting your custody case. If possible, go to a IC for yourself and your son. Your W doesn't have to go, but you should learn how to minimize the impact her actions are having.