He may try to even the score by fighting about custody of the children or how to split the marital estate.
All he will focus on is that he has been wronged and will want to seek justice anyway he can.
If the ex isn't co-parenting and the kids are too young to be left alone, she will have to hire a babysitter or at least have advanced planning to go out.
Money might also be tight for her, so offer to pay the sitter and definitely spring for all the other date expenses.
This year I came home four times from college and he was in town every single time.
After I went back to campus each time Mom said, ‘I never get to see you!