I would suggest that OP and his wife make time for a one day during the weekend cooking session. The goal would be to keep it pretty simple but the goal would be to produce as much food to put in the freezer as possible. Of course, they need to have room in the freezer to begin with or maybe they could buy a $350 smaller freezer just for cooking sessions.
Since I am not a vegetarian I cannot suggest meals for those people. If they are meat eaters, I would suggest them making as an example:
4 medium sized meatloaves. Bake in oven.
While meatloaves are baking, jump right in and make up around 50 meatballs.
You can basically use the same recipe for meatballs as meatloaf. As soon as the meatloaves are baked, pull them out and put in two trays of the meatballs and bake them.
Bag up meatballs in ziplock bags, lay flat in freezer. For meatloaves you can either slice them up or freeze as loaves in ziplock bags. Let all cool before bagging.
Next, assuming you can buy rotisserie chicken at Costco, buy two-three chickens. These chickens will need to be deboned into a bowl and separated out into 4 portions.
Portion one will be a chicken pot pie. Buy frozen mixed veggies 2 bags, add large two cans of cream of chicken soup, add some spices, add one portion of chicken. Mix and put into a 9x11 aluminum casserole dish. wrap then freeze.
For second portion of chicken (barbeque chicken rolls) could be mixed with barbeque sauce and spread inside a package of Hawaiian rolls add cheese or not. Freeze bake later on.
For third chicken portion (alfredo broccoli chicken) mix chicken with 2 jars of alfredo sauce, a package of frozen broccoli florets and 3/4-1 lb cooked al dente spaghetti. Mix well and put in a ziplock bag, lay flat to freeze.
For 4th portion of chicken (chicken soup) put chicken, mixed frozen veggies, black beans or kidney beans, drain cans/rinse beans, diced onions and diced celery. Put all in a ziplock. On day you have this add liquid chicken broth to cover all and simmer till hot.
Lastly, make up 2-4 ziti or shells casseroles. Find a recipe you like. Fill 4 aluminum casseroles, cover and freeze.
So now you have:
4 meatloaves
50 meatballs
Chicken pot pie
Barbeque chicken rolls
Chicken Alfredo
Chicken soup
4 ziti or shells casseroles
Left over meat from meat loaf can be thrown into jarred spaghetti sauce to make meaty sauce.
Meatballs can be used in spag sauce, grinders or just on a plate.
Chicken pot pie, after it is warmed up in the oven and is hot, Pillsbury Grands biscuits can be added and browned (watch they don't burn).
Cooking tips:
~If you use a slow cooker, buy Reynolds slow cooker liners. Makes clean up a breeze. No scrubbing the crock pot.
~Buy aluminum pans at the dollar store to cook casseroles in the oven. If you don't feel like dishwashing they can be tossed.
~Get a pad of paper and make your shopping list.
~Clean off you cooking surfaces and have a production line so you are not running back and forth around the kitchen. Have your ingredients out. You may need to set up an extra table.
~Work on one recipe at a time. You can make one huge batch and break it into 4 portions if that is your intention. Sometimes it might be too big to mix so take that into consideration.
~You can cook pasta day before al dente, run under cool water, drain, coat with some olive oil so the pasta is less apt to stick. Next day you can assemble recipes using the cooked, cooled pasta.
None of this is gourmet by any stretch of the imagination but you will get meals on the table.