I have 4 between the ages of 7 and 14. I have always just served the same meal to us all - with so many there will always be someone delighted with the menu and someone else less fussed, but each week I rotate meals so they all get their favourite at some stage.
Some of them would prefer not to have some of the choices, but I always put it on their plate regardless and it's surprising how often they'll actually eat something they would say they don't particularly like.
I'm very fortunate that none of them have allergies or sensory issues around food, I realise these can be very challenging.
General meals would be along the lines of roast chicken, chilli, chicken stir fry, salmon tray bake, baked potatoes, beef stew, homemade pizza, lasagne, beef stroganoff, soup and crusty bread, Mexican chicken wraps, fish pie, mango chicken etc.