We’re going to a birthday party for my 1 year old grand niece. She is the daughter of my nephew. I’ve always had trouble defining great vs grand in these kinds of relationships. I did a little research and came across this which made sense:
Your parents’ parents are your “grand”parents and you are their “grand”child. You are two generations apart. Your grandparents’ parents are your “great”-grandparents. You are three generations apart. It thus makes no sense at all to have a nephew who is two generations removed from you to be your “Great” Nephew. He is your “Grand” Nephew and his son would be your “Great”-Grand Nephew.
As Al Roker would say, That’s what’s going on in my world, what’s happening in your neck of the woods?