My grandsons would always bring their latest toys for us to admire but I have a stash of toys - cast offs from my son, other grandparents, junk shop finds, crafting bargains, etc. and keep them in the loft. When the grandchildren arrive (or any other children) there is always plenty of old Lego, Thunderbirds, Starwars, etc. plus paint, crayons, sticky things etc. I think they enjoy the novelty of something they don't have at home. I've never had any complaints anyway. Now they are overseas for a while but I have kept most of the stuff as I think they will ask for it eventually. We recently had some other children here and they loved the "treasure" from the loft.