My mom is known as Granny to her grandchildren; my dad is Papa. My sister's are Nana and MeMaw to their grandchildren. My brother is Grandpa Rich (his first name; not because of money, although his little granddaughter has him wrapped around her little finger!). I think I want to be plain old Grandma if/when I'm a grandma, just like my own grandmother's (we identified the grandma by also using her last name).