I would institute kids cook Thursdays (or Fridays) it’s great for their skills and good for taking a day off you. It can be a bit hit and miss food wise so maybe Thursday.
To start with ask them what they’d like to cook eg stir fry / pasta and they can look to the ingredients and add it to the shopping list.
Other than that I would make your life easier by doing some tray baked meals - have a look at the roasting tin cook books.
Teens always like make your own pizza night. Buy the base, lots of veg on top. Salads with.
Meze night is good - humous, babaganoush, couscous, pitta, falafel (you can buy frozen falafel and the rest in the chiller) feta, pitta, peppers etc. and they can take the rest for lunch
Tapas night based around a big tortilla - these are great for packed lunches also, and either of these meals makes good lunch leftovers.
Baked potato night - chilli is great when you have it, but cheese / ham / salad can work equally well when you don’t.
For packed lunches, depending on what they will eat, you can make up ratatouille or a roasted pepper salad, or just some roast veg - that will happily last all week in the fridge, with a rice or pasta salad also, and they can take that with goats cheese / tuna / mixed bean or lentil salad for protein. So they just take it out of the fridge each day. Hugh FS’s vegan books are good for salad recipes and the BBC site is always solid.
Filled bagels, soup in a flask with a roll or sandwich for variation.
Massive batch cooking can be exhausting and make you feel like a slave, but whenever you are cooking shepherds pie, curry etc, I would have an absolute rule you cook double and freeze half.
In the summer, give yourself a break by having lots of filling salads for dinner, maybe with one hot thing.