- Send them affordable Bitcoin on their birthday.
Give them bitcoin as a gift, but not on birthdays and valentines days and Christmas and stuff. A gift(especially for these special days I've mentioned) are mostly something to make them happy; not an opportunity for you to shove down your interests to them regardless if you have good intentions.
That's true, gifts received on those special days were more precious and special for them. As you've said that a gift should make them happy on their special day. In my view special gifts will be kept safe without spending or giving to others. So, when bitcoin is being gifted automatically it gets hold through which one can feel the best in the long term and feels much happy in the long run.