We can give our physical property but what about virtual thing.will they be satisfied 
So you have to make hardware wallet like pendrive and give it to him
It is very wise planning that each parent are thinking about their kids so keeping some bit coin for the sake of the future of your kids because with passage of time the expenses of your kids are increasing for example their education expenses as well as they need a wide house for the so I appreciate to keep some bit coin for their future. So you have to make hardware wallet like pendrive and give it to him