Grant strikes again

Grant: "Hey Mama,"

Me: "Yes Granty."

Grant: "The Earthes nickname is the World, Mama."

ME: "Good to know, Grant. What is your nickname."

Grant: "Umm Granty Panty."

Me: "What's my nickname?"

Grant: "Umm Roseanne, Oh, Rose, I mean."

Me: "What's Zack's?"

Grant: "Zackary Nackary. What's Melody's nickname?"

Me: "I don't know yet?"

Grant: "I think it's Sneemer or Raw."

Me: "What? Why do you want it to be that?"

Grant: "Because."

Me: "?????"