It's got to be
Diabetic friendly - all FIL can make is a sandwich or beans on toast - neither of which she should be eating whilst her diabetes and cholesterol are so bad.
Keep well - preferably freeze and reheat in microwave or be designed to be served cold.
She told me last night that because she needs rest (she had a horrible reaction to her cholesterol meds which has wiped her out) they were going to eat meals from the supermarket and takeaways.
They don't have much money at the moment so she won't look for suitable things she will buy whichever is cheapest. If FIL goes he will just buy what he fancies and then shrug his shoulders and look hurt when she says she can't eat it.
So I want to take them a weeks worth of food, along with instructions to FIL on how to cook the veggies. He manages to grow these, but his talent does not extend to cooking the bloomin things.