I started that 4 years ago.

I said if they want to save a small part of their allowance in sats, they send me a msg anytime in the month stating how much btc they want to buy at what price and as a reward, I double that amount.

I have made a shared google spreadsheet showing the cumulated amount of sats they own, how much that's worth in € currenty, and importantly it also shows how much they missed over time by not asking and how much that's worth.

Results so far:

- my daughter (21) has asked every month and has a sizable amount. She is markedly "long term preference"

- my son (19) has been asking only a few times when btc price is high and it flashes on tiktok. Over the past weeks, I've shown him how much he has lost by not asking. At current price, it's almost a 5-figure amount. He's bleak and can't stand the "injustice". lol.