answer:I don’t think giving duplicate gifts would be cheating. It’s just a little lazy. But with fifteen grandkids to keep track of, I doubt anyone would blame you. I probably wouldn’t give every kid a rock tumbling kit. Not because it’s a duplicate, but because each house doesn’t need more than one. I know with kids, it’s easy for a small house to get overwhelmed with kid stuff. If my kids got two of the same thing—especially something that they could easily share, I’d be like What the heck? The other thing too is that I doubt they all popped out twins and triplets. So they’re probably different ages. They’re bound to have different interests. I would choose a gift for each age range. Duplicates among your grandkids. (Doubt they’d care that they got the same as their cousin.) But not duplicates in the same household. If you like educational toys, you should check out Steve Spangler or maybe Think Geek for the older kids. Have fun! Don’t stress!