I called my maternal grandparents Grandma and Poppy. I called my er, my mother's father's mother Mammy. I didn't know my paternal grandparents, or great-grandparents. My grandmother dated a woman for.. gosh, twenty-thirty years, and even after they stopped living together (right before I was born) the families stayed close, and we called her Meemaw.

Marn called his maternal grandparents Grandad and Granmama, his paternal grandparents Nanny and Grandpa, and his father's mother's mother Nono or Nain (which, rather than being something more individual like it may seem, is just Welsh for Grandmother). Alex isn't about atm for me to ask.

Riordon calls my mother Grandma, called my step-father Papa John, and my grandma she calls Nannie, Marn's parents Granpa Mike & Grandma Liz, Alex's parents Grandad (Irvine) and Grandma Angela. Marn's parents have explicitly asked to be referred to by their names - Marn even called them Mike & Liz, not Mom & Dad or anything like that.