its interesting. and this is just my opinion/observation
this is what the WAS wanted. and now that she/they get it, they want what they left behind.
its a bit insulting that they think its still available.
last week i got the 'lets change the visitation schedule so D has more consistency' --- completely forgetting any inconsistencies in D's life were predicated on the x's need for a divorce. i've remained completely consistent, same house, same car, same job. while she is now moving her for the second time in 2 years, new schools away from all her friends in daycare, etc.
it would be emotionally satisfying, and against all you've learned here, to respond with "i'm sorry you feel that way, but this is what you wanted"
"In a ham and eggs breakfast, the hen is involved, but the pig is committed".