When Bubby was really little (maybe 2?), we tried to get her to call my dad "Grandpa," but she automatically shortened it to Pa. We all thought that was so cute -- a little country bumpkin-ish, but cute -- and continued to encourage it. So it stuck, and my dad has been Pa ever since.
Bubby and Buckwheat are both really fond of their Pa and it warms my heart. Don't get me wrong; they LOOOOOOOOVE their Grammy, too, but Pa is all fun and games. How could you not love him?!
Look at this sweet picture of Bubby and Pa from my younger sister Mariah's 18th birthday celebration yesterday. I can't handle it!