I have five children and a hubby that are good eaters. I find if I up the fats in the main meals, my children are more satisfied, so butter or cream with full cream milk and a little maple syrup on the porridge (oatmeal) of a morning, or a big batch of scrambled eggs or baked beans on toast for breakfast. Plenty of butter on the bread rolls or egg mayonnaise or hummus on the sandwiches for lunch or I make a vegetable slice/quiche for lunch with salad or chopped fruit (slice is 5 eggs whisked, 2 grated zucchini, a grated carrot, couple of rashers of bacon diced, one onion diced, a cup of plain flour (add a little extra if looking runny, should be thick mixture like peanut butter, but not a dough consistency), quarter cup of olive oil, 1/2 to 1 cup of grated full fat cheese, salt and pepper to taste, poured into a slice tin or quiche dish cooked for 40-45 min on 180 Celsius) – I would prob do two for a family of your size, any leftovers are nice cold too.
I also love a Mac and cheese with chicken or tuna stored through. A big drink of water a bit before or after lunch often helps my kids too.
big pots of roast pumpkin soup with bread rolls is easy too, can be done in a slow cooker.
I also make a big pot of chicken noodle soup with lots of veggies and bread rolls with plenty of butter, cooks on the stove most of the day.
Big pot of bolognaise sauce with hidden veggies can be used on pasta, then on toast for brekky and baked potatoes for dinner with cheese and sour cream. I often serve full fat yoghurt after dinner as “dessert”, I find that often fills them up enough.
snacks here include a handful of nuts or boiled eggs or cold roast chicken/sausages, tinned tuna and mayonnaise with crackers or veggie sticks and hummus, popcorn if I remember to buy it. One piece to two pieces of fruit per child per day as I find even the sugar in that makes them inclined to snack more. I try to keep those items accessible in the fridge/pantry. Banana and yoghurt smoothies sometimes. My daughter loves an avocado mashed up with salt, pepper and lemon juice with carrots sticks for a snack.
I also really love this one, it makes a lot and I serve with rice, I swap out the cayenne for paprika and the water for bone broth but your MMV.
https://www.seriouseats.com/new-orleans-style-red-beans-rice-recipe
i hope that is all clear, I am in Australia so some terms/measures differ. Feel free to ask if you have any questions.