And tell me this hasn't happened to any of you: You've seen one grandma fairly often (say your maternal grandma) and when your dad says "We're going to see grandma!" you think, "Yay, I love grandma" then you see his mother for the first time and she's an unfamiliar old lady and you're like, "that's not grandma!"
Ours were clearly labeled. First there were regular grandma and grandpa. They lived near the school and we sometimes ate lunch there. Then there was Granny West, my dad's mother. She lived on the other side of the country (in the Westland -> Granny West) so we only saw her a few times a year. When we went there, lots of other relatives would come over as well. My dad had nine siblings so the living room was always crowded with uncles and aunts. Not many children our age though, so visiting Granny West was very boring...
Great place to earn some pocket money though. Our uncles basically gave us cash to bother other uncles.
"I'll give you a guilder if pull out one of uncles ****'s nosehairs!"
"The one who makes the loudest handfart gets a quarter!"
"One guilder for you if you can put salt in his coffee without him noticing!"