Marian: "Kateri, has it been fun being four?"
K: "Yes."
M: "Do you think it might be even more fun being five?"
K: "Yes." (Thoughtful pause.) "But I really like having you for my mom. So I don't think I want to grow up."
To which I responded, as every mother who ever lived would have: "I'll always be your mom."
And Kateri, who may be more ruthlessly practical than we realized, pointed out this inevitability: "Until you die."
Even then, sweetheart, even then.