Dinner at hospital for family of 5? (child is patient)

Pizza, if the patient can have it.

Yes to the one-dish thing -- maybe lasagna, if that's okay for the patient to eat. Salad -- buy a salad-in-a-bag (   ) to make it easy. Grapes for the fruit -- easy to eat. Maybe bring some other fruit to leave in the room -- bananas, clementines, small apples. Dessert -- something easy to manage like brownies, or bars that you make, cut, and wrap (that way the leftovers can keep in the room). Drink -- juice, sparkling water, whatever you know they might like. If the parents are wine-drinkers you could buy a couple of those small bottles of basic white or red wine. They won't win any wine connoisseur awards, but they're drinkable and then they don't have to worry about carrying an open bottle home.

Buy those sturdy picnic plates, not just flimsy paper ones. 
Nice paper napkins, maybe in a Halloween theme since that's coming up.
Halloween goblets (like from the party store, not expensive) might be fun to drink from.
Orange plastic forks/spoons/knives. (just going with a Halloween theme, you could actually do any color theme you wanted if you go to a good party store.)
Utensils for serving.

If the patient will be there for a few more days what about a little basket of various things (make sure edible items are allowed if he/she is on a special diet) like gum, hard candies, small chocolates, lip gloss, small iTunes gift card, fuzzy socks, whatever...)

Yeah, I know I'm repeating what others said, but I'm just thinking out loud.

Wow, the logistics of this is just confounding me. I'm going to take a leap of faith and believe that there is some sort of family break room. If not, I have no idea how this would work.

But if there is such a room then rather than ask here I would have asked the parents what the child's favorite is. I mean that is who you are preparing this meal in honour of isn't.

I would also make sure that the child is allowed regular food, regular texture and that there is no test booked that would create a nothing by mouth order.

I assume (boy I hate that word) that since the parents agreed to this that they know the child is allowed to eat food brought into the hospital by non family.

Why would the logistics be hard? There are always several tables in a patient's room -- bedside, and the one that swings around. Pediatric rooms also have extra chairs/pullout bed/whatever, because parents are allowed to spend the night. One of the hospitals where I have worked has every room as a private room, and there's plenty of space for people to visit. Obviously not all hospitals are that enlightened (including several in my area) but pediatrics rooms are always set up to allow for all sorts of visitors, unless it's an isolation unit or something like that. Even then they can have visitors, but probably wouldn't allow a meal to be brought in.

We have patient's famlies do this all the time, so it's not such an odd thing. Hospitals will have availabel utensils, etc. But I would bring my own, but if you forget something I would ask them. Alot of families just order out for pizza or subs.

Bob Evans Soup to Go, Rolls & Desert . . .