WoW! That's about all I can say! Yes, my W has used the kids as a weapon in the past... well... I was gonna say not as bad, but certainly a little different... really sux...
As 25 said, too bad that wasn't recorded, but this is the type of stuff you want to journal. Then, at least it's something you can mention to your lawyer.
And my advice? Do what ever you can to not get into it with your W. I know what it's like. And while I get more than 10 or 20 days a year, I cherish ever time the kids visit. Here's the thing...
Last time my W tried this, I reacted, but not to her. I vented here, I contacted an L to seek an interim court order... but I said very little to my W, other than asking if she felt that was right for the kids. A couple days later, she gave back what she had "taken" and while didn't say the words, for the most part apologized.
God, their guilt, karma... whatever... it comes back around... Have faith...