I'm not sure I agree entirely with FlySolo. I think you should engage her in order to reestablish contact with the kids. Otherwise you leave yourself open to accusations of abandonment. Anytime you text, call, email to try to talk to your kids, write it down in a notebook which can be used later in court to show that you are actually trying, but she is actively blocking you. That will also turn the tables on her, and make a judge look very unfavorably upon her actions. But just like he said, you have to be EXTREMELY CAREFUL about what you say and how you say it. If you can have a witness, even better.
Definitively see a lawyer.
M:23 T:26 Me:53, Wife: 60 S:18 D:16 filed 7/16 W moved out 4/28/17