For shelf-stable items for kids:
Peanut Butter
All Fruit Preserves (2-3 types)
Maybe a 2nd type of nut butter - my kids love Nutella
Crackers (so if bread runs out, PB crackers are an option)
Tomato Soup, Chicken Noodle Soup
Mac and Cheese Cups, Spaghettios
Cereals (single serve might be great)
Oatmeals (single serve)
Dried Fruits - Cranberries, Raisins, Dried Apples, Dried Apricots
Rice Krispie Treats
Goldfish
Microwave Popcorn
Fruit and Veg Juice Fruit Snacks
Nutri-grain bars (or other granola bars)
Shelf-stable Yogurt Pouches
Fruit Sauce Pouches (Apple, Multi-fruit)
Diced Fruit Cups
Nuts pouches (honey roasted or simple salted peanuts)
Box of Flavor-Ice (great dessert item)
Hot Cocoa Mixes (the ones with the extra calcium that just use water) (another great dessert/cold winter item)
All-Fruit Juice Boxes
Milk Boxes
Bottles of Apple Juice, Orange Juice, Grape Juice, Pineapple Juice
To add dinner items
Pastas - Spaghetti, Ziti, Tortellini (the filled stuff)
Pasta Sauces - Lots of Tomato...then maybe an Alfredo and a Pesto
Parmesan Cheese (big jar)
Jars of Roasted Red Peppers
Diced Tomato Jars
Jar of Minced Garlic
Olive Oil/Canola Oil
Nice Salt/Pepper
Boxes of Instant Rice, Cous Cous, Quinoa
Roll of Polenta
Cans or Pouches of Tuna, Salmon, Chicken Salad
Chicken Broth quarts
Shelf-stable root vegs - potatoes, sweet potatoes, onions, squashes
Evaporated Milk (always good in a pinch if you run out of milk)
Jars of Chili/Beef Stews
Spices - Italian Seasoning (or Basil), Thyme, Rosemary
Fruit-based Muffin Mixes
Pizza Crust Mixes
Biscuit Mixes
Pancake Mix
Veg Dressing (Ranch or Blue Cheese)
Ketchup (boy does my son eat ketchup!)
Salsa
Syrup
And for the freezer/fridge
Mozzarella Sticks and Shreds
Cheese Slices
Stouffer's Family Meals (or another option)
Chicken Tenders - either prepared or fresh
All-beef Meatballs
Frozen Veg - Corn, Peas, Spinach
Frozen Fruits (Berry Blend, Peaches)
Apples/Oranges/Bananas
Baby Carrots
Breads
Waffles/Pancakes
Eggs
Bacon and Sausage
Frozen Pizzas
Frozen Ravioli
So, those are my ideas
...what I might do is make a kid box and sneak in a few of the shelf-stable dinner items from my list and then make a giant shelf-stable fruit display for the mom (buying the fruits a day before)...
I'd put a pineapple in the center, and decorate with clementines, apples, pears, lemons, limes, green bananas, oranges, grapefruit, mangoes, pomegranates, etc and make it seem "gift-like" and not "charity-like"...I'd probably buy a bowl or plate and cellophane to pull this off (I wouldn't buy grocery fruit baskets b/c that fruit will be 5-10 days old, and you will want the freshest you can get)...