I feel your pain and your fear. Kid has never met the turd party and God (and me) forbid that she should ever be introduced to the turd and her kids.
But once, kid asked me how I would feel if the turd is good to her and she likes the turd. Let me tell you, that was one of the terrible moments when I had this all -consuming urge to smash the turd's windscreen to bits and expose her in our profession for the manipulative tramp that she is.
I didn't look too happy but I told the kid that I couldn't tell kid how she should feel. And if the turd is good to kid, at least she's not being nasty to kid.
It svcks. It really does. On your behalf, I hate the OM, your xw, your xils, for their selfish and self- serving ways.
But like what Sotto says, what happens with the xw and om is not within your control. You will always be your children's father and you can start building new and memorable traditions and routines with him.
You can call me Dory/ Grl.
As a wise fish once sang,"Just keep swimming!"
It's no use to go back to yesterday because I was a different person then.