Hello, Dawn!
You'll be pleased to know that there are many accommodation options for families of 5 who need to be together. As a matter of fact, there is a page dedicated to this very topic on Walt Disney World's website; it's entitled
"Rooms for 5 Guests or More." It's your lucky day! :-) What's great about that post is that it gives Guests options in several categories, so you'll be able to find something that works perfectly for your family. Check it out and send me another question about the resort you're considering. I'd love to help!
Regarding simple dining options, you could certainly consider the Quick-Service Dining Plan, which offers Guests 2 QS meals per night per Guest, plus 1 snack per night per Guest, as well as 1 Resort-Refillable mug per Guest per stay. There are other
Dining Plans which you might find enticing, too, such as the Dining Plan, which offers Guests all of the above, except 1 of the Quick-Service meals is a Table-Service. Take a look at the documents I've linked above, and take a look at "Dining" on each of the Theme Park's (and Resort's) pages. If you see that there are Table-Service restaurants which interest you (all of them have kids' menus, so not to worry) you might want to consider the Dining Plan that offers you these opportunities, too.
Send more questions as you think of them; there are so many options, I'd love to help you choose what's best for your family!