I'll try my best
Dad (Independent):
All Democrats, first voted for McGovern
Mom (Democrat):
All Democrats, first voted for Carter
Mom's mom (Democrat)
All Democrats, first voted for Stevenson
Mom's dad (Democrat, but I never knew him)
I would have to guess all Democrats
Dad's Dad (Republican, this is a guess, again, but from what I've talked to him about):
1952: Eisenhower
1956: Eisenhower
1960: Kennedy (my grandpa's a Catholic)
1964: LBJ?
1968: Nixon
1972: Nixon
1976: Carter, I think
1980: Reagan
1984: Reagan
1988: Bush
1992: Bush
1996: Dole
2000: Bush
2004: Kerry
2008: Really not sure, probably a McCain supporter until the financial crisis, but I'm not sure how he actually voted.
Just check to see how he voted. It was for Obama. Palin ended up being the deciding factor for him.
