The anger mindset is the initial stage, and can make hard times worse if you let them. Tragically, it can outweigh what the children want. In NC & FL, there is an age of accountability that can vary but its around 12-13 years old.
The kids can have a say, regardless. A good lawyer may recommend an arbitration meeting regarding custody. It is very tough, and lawyers can turn it into an even tougher thing. But if your kids are old enough, and want to be with you as a primary custodial parent, they may have to tell it to a judge.
I had to sit at a huge table, at age 13, and tell a judge I would rather stay with my mother. The whole time my Father was just staring at me, something I'll never forget. However, he traveled 200+ days a year at the time, and I wouldn't have seen him anyway. He had a big ego and just wanted to "send a message" to my mother... It all becomes water under the bridge.
Things can be better if you remain solution oriented, a cool cucumber, and find a way.
Never let anger guide you. It sounds like your much more level headed. Fight the good fight, advocate for your kids wishes, and never let her make them a pawn.
Your in our prayers Brett. Please never hesitate to contact any of us at any time.
Tom W.