Re: Leaving Baby may need to Scald milk.
Have you checked your frozen milk? You don't scald your milk before you freeze it??
I am not sure if the milk would be ok scalded for a week, that would make me nervous. I would put the frozen milk into large ziplock bags, put mostly ice and some water in a cooler and bury the milk in there. It should stay frozen. Even if it partially thaws, you can refreeze it.
Could you stay overnight somewhere in the same town as your baby just in case things start to go badly with the in-laws? Or you can't stand being away?
Lilah 10/08 nursed 25 months
Beatrix 01/11 nursed 30 months