SC holidays in a family home (whether a holiday home or visiting the everyday home of other family members) is a different holiday even to other SC hols.
I hope the takeaway and beer were good but for future plans:
Agree re booking a supermarket delivery or else make sure you bring a good list to run in quickly or bring the essentials in the car. Also, if a holiday home - invest in good sealed glass or plastic canisters to be able to keep supplies of things like tea bags, sugar, rice, pasta, flour, cereals etc. and keep a good range of good tins and jars so that you know there will be the basics there without doing shopping. (I don't include coffee as we prefer ground and that does need to be fresh).
We usually bring lots of nice foods that signify holidays to us - posh crisps, good biscuits, items from local deli or M&S to nibble on, hummus (and carrots to make stick for dipping - sometimes I even buy them pre-cut as after all, I'm on holiday...). Lots of fizzy water and nice cordials, as well as plenty of beer, wine, gin. And things to easily make picnics, and Jusrol croissants for breakfasts.
Younger people are given suitable jobs - setting tables, emptying or restacking dishwasher, carrying things to/from table etc. Older people who should be helpful,might be given more useful jobs like entertain smallies, make a whole meal (their speciality - pander to them and they will eagerly get stuck in), or set up different areas to allow a few people work together preparing meals etc.
On that note, make sure you have some decent tools and enough to be able to have 2 or 3 people working together so maybe a couple of chopping boards, sharp knives, decent veg peelers, etc, plenty of spoons to mix things in bowls or stir pots.
For cooking, think easy meals, like throw some marinade on fish or chicken in the fridge in the morning to throw in the bbq in the evening, buy in salads, or do veggies in tinfoil parcels on bbq alongside the meat/fish. If you have a box of decent ziploc sandwich/food bags alongside your tinfoil in stores, it's really handy to prep things in the morning while breakfast cooks or you wait for some one else to get organised before you go out, and then you just cook them with no prep in the evening. And you then get to hang out with DH and everyone else outside enjoying a beer while bbqing. Buy in salads and crusty bread some nights. Prep enough veggies etc for 2 nights and take an easier night the 2nd one. (Or have some good Tupperware type containers for this pre-preparation purposes, and for leftovers).
Do 1 tray dinners in the oven, make use of things like oven chips or baked potatoes, or use a timer to set things cooking and leave it get on while you relax.
And while you might make spag Bol or chilli from scratch at home - have a few shortcuts for holidays like packets of seasoning or good jars of sauce.