That's actually a wonderful idea! But for me, instead of buying bitcoin I would just pass to them all earnings I would gain and as early as now teach them how it works so they would have more options whether they wanted to have a personal investments or just continue what I started.
Indeed it is a wise decision, you are right we should at least hold some of our earnings here in bitcoin or just some part of it. We should take note that bitcoin will really become a million dollar worth do not hesitate as it will really happen.