I think a lot of families do this.
They put in money in a bank account in which they dedicate that to their children usually for their college fund or something like that. I do see the point but honestly I think it would be better if you just put it in to crypto. Even if it is locked, fiat money will still lose value over time unlike in crypto especially in bitcoin.
I am cautious about advising individuals on the long-term retention of Bitcoin for their family or children. Its security vulnerabilities make it susceptible to theft, with little to no possibility of tracing or recovery. Instead, a portion of such investments could be allocated to cryptocurrency, while the rest could be diversified into more stable assets like fiat currency and real estate. Although these alternatives may offer lower returns on investment, they provide easier and safer avenues for wealth preservation
I don't like to give financial advice either, everyone should do their own research before investing in anything. One of the facts is that as time passes, fiat currencies lose value, even when someone keeps money in a bank and earns interest on that amount, that interest does not cover the loss of value. So what the OP is suggesting is a bit strange, why would anyone keep/lock money that will lose value over time? I understand people who keep cash at home and don't want anything to do with banks, they are clear to me... in case things go downhill it's good to have cash with you, banks can lock up and limit withdrawals at any time.
Crypto has proven to be a very good investment, Bitcoin the most but other coins have achieved a lot in the last 10 years, and I think that trend will continue. So I guess it would be easy for anyone to invest in crypto and lock/stake some amount for a longer period, I think it's way better than dealing with banks.