Small portions and complete meals work best for situations like that. (For new moms, too). I might consider small, straight sided aluminum pans with cardboard lids, wrapped in an extra layer of foil (a restaurant supply store would have them). They'd need to be heated in the oven or transferred to a microwave safe plate, but you could add frozen veggies and a starch and have them all ready to go.
Batch cooking will save your sanity. Once a week, set aside a few hours to shop, prep, and make a batch of food around a central protein. You end ip only needing to chop veggies once, dirty up pans once, etc. Use whatever is on sale to determine what you plan.
For example:
You could get a big batch of ground beef and make:
Individual meat loafs in muffin cups
Swedish meatballs
Hamburger vegetable soup
Lasagna in muffin cups
Freezer sliders
Brown bag burritos
With a big batch of chicken breasts or thighs, you could make
Homemade chicken hand pies
Chicken, broccoli, cheese & rice bake
BBQ chicken and corn muffins
Chicken stew
Chicken soup with rice
With a ham, you can make
Ham & veggie muffin size quiches
Ham pizza pockets
Ham & bean soup
Sliced ham with mashed sweet potatoes
And on and on...I've done these off and on for a while and they work great. Stay away from potatoes and pasta. Dairy is tricky, but doable. I don't have a single website or specific links, but I know I have gotten a lot of recipes from Alton Brown, a few OAMC websites, and the blogs 'Can you stay for dinner?' And 'Big red kitchen.'
I hope their recovery is swift! And good on you for taking a helping hand to them. I bet it is appreciated.