Pee Wee McFly
From Futurepedia, the Back to the Future Wiki
Pee Wee McFly was an indirect ancestor of Marty McFly. In 1897, he was a pitcher for the Boston Beaneaters baseball team. He was pressured by gangster Diamond Jim Tannen to lose a game, but Marty stepped in to help him win and to get Tannen arrested.
[edit] Notes
It was said that he was Marty's 5th cousin thrice removed, making him a 5th cousin of William McFly.
