You know that is weird. Something similar happened to me a few months ago. The girls had commented that there is no fruit or Ramen Noodles at their father's house. So I sent them with a bag of Ramen Noodles and some fruit. D9 brings it back saying XH told her to bring it back home!
Now see it's no different than what I've done in doing day care or simply just trading kids back and forth with friends or family. In order to help out we just send the kids favorite foods to eat at their house.
