This is what bitcoin is, but if they don't have the understanding of what you mentioned above about bitcoin it won't be of anything to them. Bitcoin as birthday gift will be meaningful to them except they understand it value and knows what it is. Giving bitcoin to people who don't know much about it is like giving money to a baby who does not know what to do it. Bitcoin should be given to those who have Interest for it and make more value from it.
The most important thing is not just giving gifts, we need to teach anyone about independence, it is okay to give gifts to anyone, even though this is not a good culture to apply in life.
But I think the gift given should be used, for example the OP gives a bitcoin gift to his brother, what needs to be considered is whether the brother can increase the number of bitcoins he currently has, because if it only stops at the gift stage, the bitcoins given will not be able to play a role in investment implementation.
Knowledge of Bitcoin, Blockchain, wallets, and others needs to be taught in as much detail as possible, so they don't get lost in a narrow understanding.