Keeping other physical asset for your children is very easy but storing bitcoin for your children is very risky because the wallet may be hacked before your children grow to maturity so it needs a high level of security consciousness.
It seems to me that bitcoin is easier to save than anything else that has a physical form. Your savings in fiat can be stolen, your apartment can burn, and the car can be stolen without a trace, even your wife can get away from you, and you will have bitcoin. At least as long as you have a private key.