Eek! Tough choice. Is there any way you SIL could stay at your house?

If you know staying in a hotel alone will stress Chester out, he'll probably be less stressed if he's in an enviroment he's familier with.

Though, I'd be worried that the dogs are getting into stuff and escaping if they were left home alone and only checked on once a day by a family member.... urgh.

I don't know! Have you ever been gone for that length of time before?