Your parents parents, usually old. You may not want to visit them now, but when they open up, you will hear well-spun stories of their "glory days". And if you are lucky you will hear stories of their many diffrent conquests, being either drugs or boyfriends/girlfriends. War stories are a popular and exiting one. Maybe their immagration from a diffrent country in times of need. They will enjoy talking to their grandchildren, offering advice or just being in your presence. Enjoy them while they last, they are not here for ever.
Grandpa: "I remember when I was 22 and me and my friend bought some LSD and went train-hopping around Canada"
An old man who fought the Japs in WWII and sends you $100 dollar checks which signify the approximate amount of love directed at you. Carries the name "Grandpants" due to the high position of the Sears Docker Elastic pants he wears above his hip bones. He also loves Spaghetti and Meatballs at Dinos, hates awkwardness and negroes. Favorite phrase is "Ehh your a good kid Brendan, I live next store to the niggers."
An excellent decision. Are you bored with the usual mumbo-jumbo your grandparents talk about? Bring alcohol into the picture! It will spice up any conversation, and your grandparents will either think you're a degenerate, or a comedy god.