I think that's good for you and your child, that means you have to teach and introduce bitcoin to your child. But children usually just want to have fun and become a foundation to learn. So you do not have to force them to know and do what you do in bitcoin. Let them do what they often do as usual. If you want to keep bitcoin for your child but they do not want to know, you can trust the bitcoin you save to your relatives and give it to him to give it to your son someday.....