Two Grandmas

Lately, Max has been concerned with death, as his awareness of it grows. He posed his question to me:

Max: "Mom, who will be my grandma if Grandma dies?"
Me: "Nana will still be your grandma."
Max: "WHAT?" "I have TWO grandmas?!"
Me: "Yeah, what did you think Nana was?"
Max: "Just a person."

Then, I elaborated a little bit about the family tree and where his grandmas stood, relative to his father and I. To make sure he understood, he reiterated back to me:

"So Nana is daddy's mommy and the old one with the two dogs is your mommy."

Ouch!