Primo: Thanks for offering water to Mike. I get all "Wooooo!" and I forget to do those things.
Me: It is the polite, gracious thing to do.
Primo: I know, but I get all distracted by too much going on.
Me: It's not like you were taught to do it. The first time we went to your mom and dad's, we arrived at lunchtime and they didn't even offer me a glass of water.
Primo: They probably thought that I would get it for you
Me: Uh huh. Just like my mom. Oh wait! NO! She emails me weeks before we visit asking what you want to eat and making special things just for you.