I was about to reply yesterday evening like Amy did, but now you have cleared it up.
Maybe the counselor will let your STBXW know about D14's anger towards her. It is not up to you to interfere though.
Your job is to just continue to be the stable father in their lives. They will come to their own conclusions about the divorce and relationships to their parents.
I hope that I never witness my kids have negative feelings about their mother. I wont fuel the fire, but I also dont plan to try to repair any problems between themselves and their mother (or step dad).
