I presume "her two children" are your son's children. :)
You do understand that you didn't post a question. I wouldn't bother suing this person, though you're free to do so. Not clear how you lost everything if someone else stole your checkbook and presumably forged your signature; I'd be taking issue with my bank's actions with regard to cashing forged checks and not making good on the money. That's the party with the deeper pocketbook vs. some jailed or indigent drug addict.