Thank you all for your kind words.
My dad called and said the restraining order was served, so if she tried to contact me or go anywhere the kids are I can have her arrested. She is furious my dad for telling me. He kind of unloaded on a lot of stuff that she's been doing that I didn't know about. It's hard to imagine how he's been living in that environment (and my 21 year old nephew, too). But he's an adult and he gets to decide when he's had enough.
I feel a little safer now.