Welcome to California!
Sorry Cap.

Maybe time for a heart to heart with your man. Tell him his comments are hurtful.
It will be a test for him for sure, but I still think he will do okay. With all his problems, he still has his intelligence.
He can look up how to use the microwave on the internet. There's bound to be a Youtube video about it.
Hopefully you can get a day nurse or worker to come in for Tom's meds. That is a huge responsibility and can be confusing. Unless Tom can keep track of what and when? Does Robert even get up in time to give Tom his meds?
Maybe SD can stay and help with that.
Necessity is the mother of invention, and maybe they will get it figured out because they have to. Can you make sure there are things they can eat easily? Gallon of milk and a bunch of cereal. Bread and peanut butter and jelly. Maybe some lunch meat, some bananas, cheese and crackers... things that don't need cooking so they won't starve.
If you end up in Cincy, did they tell you how long you would have to stay?