L.S.
I think there are a lot of peope in the same boat as you trying to feed everyone and not break the bank doing it.
Have you tried shopping at Save-A-Lot instead of shopping at the regular grocery story. I have been shopping there for almost a year. They have been pretty good. Granted they don't have a zillion things to choose from and there are somethings you need to go to a different story for, but they have all the basics. After talking with several neighbors as well as friends I would estimate that I save almost $100 per week.
Also, I usually make up menus for dinners for the week and then make my grocery list from that. I have one cookbook that is my all-time favorite called "365 Quick, Easy and Inexpensive Dinner Menus" by Penny E. Stone. Robin Miller from FoodNetwork also does quick fix meals. She has a lot of morph meal ideas, in which you get many meals from one recipe.
Hope this is helpful
L. S.