Tucker calls every man with gray hair "Pa" in honor of Papa. It's really special. The first time he did it, I thought it was just his random babbling... but it happens now almost without fail. Today we were walking in town and an older gentleman smiled at him. He looked at me and said "Pa." I told him that he was going to get to play with his Papa soon.
Incidentally, I'm trying not to be offended that he says Papa and Dada before he's even tried Mama, (though he made the mmma sound for the first time the other day, so it's close!).
Next up: learning to say Henny and JoJo.