Both games are challenging and have masters, but are so different I can't see the commonality in them.
Checkers before Chess for Kids

A steady hand is best ....so Operation is my pick ....before you let the lil' darlin's loose on your Jaques pieces.

http://article.sapub.org/10.5923.j.ijap.20160604.06.html#Abschess may be a treatment to ADHD. So bobby_max teach your niece chess next.

The problem with Checkers is it has to many styles.
- Some Checkers have flying Kings which move like Bishops.
- Some Checkers have pieces which can capture backwards.
- Some Checkers have pieces which don’t have to capture at all.
I like playing American Checkers.
- Force Jump
- Kings move only 1 square
- Kings only 1 who can capture backwards.
I learned to play checkers before chess as a kid. I played both strongly. I believe checkers should be taught before chess so kids can learn chess better. Thoughts?