Or atleast ask if they have a plan and understand that yorkies can sometimes bite there kids, and if they are going to be okay with the biting and just section off a part of there house for the little guys. It shouldn't be banned to all kids.
But I can also see the flip side. They are concerned for the little pup that they put so much time into and had so much stress over. I can see why they make the rule, but I can also see why they should meet with the kids and see how they act.
Anyways, Good luck with the search of your pup.