You sound awesome! Funny how they remember us when they need something. It's interesting that he thinks he can claim the kids when he's not been paying child support and the kids are living w/you. That's some real good thinking there! LOL!
I think you did the right thing by forwarding his request on to your lawyer. Let him/her deal w/him.
Enjoy your weekend!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.