We're just telling them and keeping a manual tally and will send them the Sats on their 18th Birthday if their capable of self custody. 

We did this for a couple of older nephews a few years ago, which was less successful:

BTW: I meant Sats, not BTC 😂 

nostr:note18glz0vpd3wjg5arhfzazxajls0z26hp9fn925ujuh8nnc3n6c40qethplr