Cheryl Hernández, homeschool mom of 9, gives tips on how to teach the virtue of self-control to young children. Part 5 of the series explores sitting still.

As I took a little trip down the memory lane of my mind, I started to explain to my little children that, although I was 42 years old, I had never quite “graduated” from the kids’ table. At first this bothered me, but I had come to respect the camaraderie, the conviviality...