As you know, you can't completely 'go dark' when children are involved, especially school issues.
As K4D says and I can tell you first hand, yes, the kids will play on both of you. It's unfortunate that at this point in time yours seems to be focusing on playing into the hostilities of things. Mine did the same. But after enough of (x)W and I putting our issues aside long enough to handle issues with the kids, the kids started to play on the good side of things. They saw and were told, mom loves and dad loves you, and when they'd question that and be like 'well then why can't you love each other?' and we both said we do, and that gets back and forth too.
I know S11 is still very angry inside with (x)W over all that's happened. So, he still does create a little mischif and alter waht she says from time to time.
Me 35/XW 33 S13 & S12 M: 10/17/98 OM & S: 07/08 D final 06/09/09 12/03/09 - 06/13/10 "Piercing" 06/13/10: Engaged to Re-marry 10/17/10 06/25/10: Expecting baby #3 2/14/11