This idea is so great and just shows how loving and generous you are to your nephew. But looking at the big picture I don't think that it will be possible now because you just said that your nephew is just 4 yrs old. Maybe the better thing that you can do is to make that amount grow and when times comes that your nephew is old enough then you can already give it to him.
He's a loving uncle and I hope he's one of my relatives that are in crypto but sadly, no one has ever get interested to it in our blood line but only me. It's okay if his nephew is young, like the 0.01
BTC that he'll give is also young so until it grows together with his nephew the value will also grow.
You will love to see it growing.
That's nice of you being an uncle but I don't think if that would be a great idea since you have mentioned that your nephew is just 4 yrs old. Well giving it to him is a good thing but how can he evenre make it grow? You have a great idea but it's complicated it your case especially your nephew is not yet aware of the systemtime. My advice for you is to make it grow first then give him some soon.
His nephew doesn't need to do something to grow, it will be stored on a paper wallet so there's no need to worry about that.
It is like an inheritance.