X demands full custody because I'm engaged, Part 2

[sleeper]

X spoke with me last week. After the wedding there will be a lawsuit. She is adamant our children will never live with fiance's children. She has been fishing for something she can use as a reason. She really doesn't have anything as she states concerns about fiance's kids behavior and their grades (not as good as her children's?)but that won't stop her from making trouble, taking me to court and dragging us through the process.

I believe she has been working on our kids too. After her failed attempt to have the kids live with her all the time last fall (right after engagement) she has had almost a year to sway them. They are no longer excited about the wedding as they were in the beginning. DD has "informed" me she will soon be old enough to decide for herself with whom she will live and DS now says he doesn't want to share a room with two other boys. Both have their own bedroom at X's house and she has been lavishing DD with shopping trips. I have also noticed OMH now attends every sporting event kids are involved in and X, including those X cannot attend and slipped up and referred to OMH as DD's "father" while speaking to me.

It is a very emotionally upsetting topic for me and has strained my relationship with fiance.