Wouldn't be any help on the older grands, but the 15 yr. old I can give ideas. Our oldest gr.daughter wants to receive food items. I know she gets plenty to eat at home, as her Mom is a good cook.
The oldest gr.daughter has ordered food items. So, I have picked up the small packages of chips, all kinds, candy in the boxes, and she loves Mac and Cheese Dinners. So, that was part of it.
It surprised us with her request!
Good Luck with the gifts!
Mariah