Hi, I hold a few tokens of varied nature and a few coins. I have setup a few eth addresses for the younger members of my family. I am talking about kids that are less than 3 yr old

So, what would you include in their new accounts, so that they can use it in 15 yrs?
What advice to give you,as mentioned above in the previous numerous posts for you, actual purchase will be top 15-20 on coinmarketcap. But you really are taking too long term, in 15 years the world may change beyond recognition.