V.B.
I would suggest trying a couple of things. First, try a sippy cup (the Nuby ones with the soft spout are a good transition cup) and see if he'll take that for Dad. Also, try letting him hold his own cup. Maybe Dad could just hold him while he drinks his milk and he could hold the cup himself. It is probably a comfort thing and maybe you could just give him a little leeway for a week or two until he is adjusted to his new daycare. He'll probably calm down a bit once he realizes his little world isn't turned upside down and that he will be okay with his new caregivers. Good luck! Stubborn little creatures, babies are, aren't they??