Come and Get it!

Currently I am living with my boyfriend, his dad, his brother, his brother's girlfriend, and their two kids.
Being nineteen and practically a house-wife is a pain.
But I love him and it's good practice.

So now I'm making a grocery list.
Sadly I'm new at this so I have no idea what I'm doing.

Any help is greatly appreciated.

What's a good, cheap meal for a family of seven?
(Easy to reheat, by the way, since the whole family is hardly ever here all at once.)

So far, since I've been the one making dinners, I've made:
-Pork chops w/ shake 'n bake, scalloped potatoes, and green beans.
-Shepherd's Pie, and biscuits.
-Hot dogs, shells and cheese, corn, and steak fries.

Also, some small meals here and there for lunch and stuff.

Other ideas?!