Yep, he is! Back then, when grandpa was a kid, young airbenders would go and meet their sky bison at the temple they were raised at - the bison, not the airbenders - y'know? So they met when they were both very young, and grew up together! Since all our bison live at the temple, I've known all the ones there, though.

Prince Enrique Tenzin Ulberto Naoi Indigo Aang! [ ...that might not seem much better, whoops. ]

Oh! How about tomorrow, or next weekend?

Yep! I remember from before!