Earlier quoted context omitted.
Not an issue: You already have two grandfathers and two grandmothers, how do you call them?
I'd imagine kids that happen to grow up in households with two granddads or two grandmas would find solutions - I remember we called the latter two "grey grandma" and "white grandma" on the basis of their hair colour, though I'm not sure how often we used those names to their faces. And of course plenty of adults call their parents and step-parents or parents in law of the same sex the same thing. I'm curious if ther…
Then for my grandmothers, they were both "granny" but I included their name (first name for paternal, last name for maternal).