How exciting to have a visit on the horizon. I hope you all have a wonderful time and remember all those photo opportunities.
Just a thought - if you haven't got one, could you borrow from a friend for the duration a big 6 litre slow cooker? That would be a boon with meal prep and would allow you to get it going in the morning and leave it be. My own kids love these. I have often used a handful of porridge oats too in a chicken or meat casserole, they add bulk and a bit of thickening. Chicken, onions, any veg, stock and then oats, ending with a big dollop of Philadelphia is great too. Also sausage casserole is fab - I fry off the sausages to give them a head start then just add as much veg as you have and lots of passata or tinned chopped tomatoes - a bit of chorizo for oomph and some black olives too - all this can be eaten with baguettes on the side. I'd love to hear from you afterwards how it's all gone. I bet you'll be wide-eyed at what the lads can consume! How about printing off some easy recipes too? (I'm thinking one pot dishes) and providing them with a box with the ingredients and leave them in the kitchen with strict instructions that you don't want a war zone. Good luck and I admire your daughter managing 4 teen boys, she must be very proud of their sportiness!