So very sorry for all you have been through, you sound amazing despite all of it ❤️
For little kids beans on toast, cheese on toast, cheese quasadilia (sp!), pesto pasta, tuna mayo pasta, fishfingers/nuggets and chips, sandwich and some cucumber sticks.
Make a big platter of picky bits and put it in the middle of the table. Just literally open tubs of dips, ready chopped crudités, bread and butter or pita bread, bag of nachos. Pizzas and garlic bread.
It doesn't matter as long as they are fed.
For you I'd get myself some nice M and S ready meals, some nice crisps/olives/ready made salads etc. Nuture yourself as well as everyone else.
Ocado is probably a good idea right now. M and S do a really good range of ready meals, kids meals, nice tapas-y bits and bobs. Do a big order and stock up. They do a pizza meal deal that is fab for kids, 3 for £9 on ready meals, a pasta/sauce/bread deal.
And don't be shy about booking a day/afternoon off work and sticking to your childcare arrangements and either chill for the day, or do some batch cooking. But I'd just use and abuse M and S for now.