My mom was a wonderful mom, but in my childhood i learned little more about cooking other then how to boil water, make boxed pasta, cook an egg, brown ground beef, and grill a sandwich. Most of the foods I made in college, had instructions printed on the packaging.
Finally I decide that if I wanted to feed my family I would HAVE to learn to cook, for real! I was also newly married and I got a look every time I made "cheeseburger macaroni" from my husband that read "again, really?"
I told my grandmother one time that I couldn't even grill a chicken breast, and I was terrified i would give our family food poisoning if I tried! I had some "standard" cookbooks, but even those were mostly over my head! (Plus I really was scared to death I would give us all salmonella- or set the kitchen on fire)
For Christmas I got a george foreman grill, some pots n' pans, an apron... and a children's cookbook! My grandmother told me that I had to start at the basics, and if a 10 year old can learn via a kid's cookbook... so could I! My "kid's" cookbook was this one: http://www.amazon.com/Chicken-Soup-Soul-Kids-Kitchen/dp/0...
I cooked almost every recipe in that cookbook, and then one day, I got up the nerve and whipped up a recipe from my still untouched "better homes and gardens cookbook!" And it was GOOD, and we didn't get food poisoning! Since then I have cooked like crazy, if I want a food, I go online or into my new STASH of cookbooks and I just do it!
So there is my advice- get him a children's cookbook, and let him start there. It won't take long and he can tackle casseroles... Any casserole can be portioned and frozen.
Also, if he has a slow cooker.... those recipes are usually "dump, wait, and eat" - he can make them, then freeze the unused potions, and reheat in the microwave. I love sandra lee's money saving meals (a food network show) and most of those recipes are SO easy! You can find her recipes here: http://www.foodnetwork.com/sandra-lee/index.html
My favorite there is Hawaiian pulled pork in particular: http://www.foodnetwork.com/recipes/sandra-lee/hawaiian-pu...
Good Luck to your dad!
-M.