Know what? You're the adult. Your kids are fortunate that you realize that.
You don't know for sure why she fought for custody. I doubt she does, except it seemed like the social norm. Could be for money, could be she "felt" she should for the kids. She obviously has some issues, my friend.
That said, document it. You'll need it later.
And don't be surprised if there's more. As a father, do your best to keep the kids from feeling it - it would really suck to feel like your mom doesn't want you, ya know?
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."