My cousins are all older than me on both sides and therefore made up the names for each set of grandparents. On Mom's side, her parents were intended to be Grandmommy and Grandaddy when they were little and then Grandmom and Grandad when they got older. Idk what the issue with my cousins' brains is, but they are full grown adults and still call my grandfather Grandaddy. I didn't have a relationship with them growing up, but he is referred to as Grandad. I was only around her a few times in my life before she passed, so I addressed her as "Grandmother". Now I refer to her as Mildred. You can tell I never liked this woman.