Our plan for our kids: sats accumulated via RoboSats (on Lightning) and Breez Wallet. Most of the sats moved to ColdCard cold storage with passphrase (using Muun Wallet to move from Lightning to on-chain & Specter Desktop to access ColdCard addresses). Watch-only wallet setup using Blue Wallet for kids to see their savings. Added benefit, kids get to play around with the small number of sats left in Breez to try out value for value transactions on podcasts.

You might need to play around a little, but these are exciting times :)