Yes I have bought a couple of coins for my children. It may seem absurd to some but I took out my money from my savings bank account and invested in some coins. Basically the money I invested are not just for me but for my family who will need it someday, kept the private keys somewhere really safe and no one to get a hold of except me.
It's not absurd, if you understand the technology and have a really good foundation on the coin that you have invested, then it might be a treasure in the future. I don't have kids right now but I'm thinking if I managed to have one, I will be teaching him a lot of stuffs in information technology. Mathematics or programming (but I will ask first if he want to learn that stuffs) and if I do that I think he will discover himself the crypto and later he will learn by himself. For the meantime I'm saving money for my future.