If she wants a trade then she must have to give up one of the big holidays coming up depending on your faith. X-mas, New Years, the real Thanksgiving not the Canadian copycat. You can make worth your while or stick to the schedule.

Look she knew it was your time, but made sure the kids got exposed to what the OM's family was doing etc. Look its bad enough the OM stole your wife but he doesn't get to steal your holidays with the kids as well!!!