I lived in a collective house which was vegetarian and most of our dishes are adaptable. We ate a lot of stews, pasta, and thinks that could be mass-produced easily like homemade veggie patties.

A good veggie pattie which can be a burger substitute or a sausage patty substitute (with more oil, smoked paprika, and sage) is 2-4 parts mashed beans, 4 parts cornmeal, 1 part chia/flax seeds, 1 part cashews, and 1 part pepitas/sunflower seeds. Finely chop the seeds, sautee them, then just-cover with water and simmer for 5 minutes. While they are simmering, add the flax seed and let it form a sticky gravy as the binder. Mix all ingredients in a bowl with whatever spices you like and form into 2" patties. With practice, you will be able to make 3-4" patties.

I'm afraid I only have experience buying and cooking for 1-2 people.

I have seen a lot of great premade vegan chicken nugget and mac and cheese options for kids (even dino nuggies!), but generally we don't do a ton of prep cooking on Sunday since one of us is hybrid wfh. There are lots of youtubers that have shared their bulk cooking recipes online and even show you step by step how they do it. I can go hunting for some good ones and DM you if you like. From what I've seen, the building components for bulk frozen meals include lots of plant based proteins (beans, tofu, seitan, soy curls, other fake meats), veggies, fruits and then some sort of carb like rice or pasta.

We do like to make a big one pot recipe each Sunday since we know that we don't like to cook on Monday. Usually it's something like daal, curry, black bean chili, fake chicken noodle soup, or misc stir-fry. Daal is one of our favorites now, and neither of us had even tried it before going vegan.