Start at an early age explaining the game to your child. Just as it is easiest to learn a foreign language when you are young, developing and understanding of the game of basketball at a young age will allow for that child to be able to understand the game, so much better as they get older. Establish the building blocks that they will need as they get older and really get into the game of basketball.
Help your child to get better with basketball drills but do it in the right structure and the benefits will be there for a lifetime. Remember that basketball is a game, and when a kid is young there needs to be pure enjoyment in the game itself for them to truly be motivated.