Angus Griffin is Peter Griffin's great-great uncle.
In "Brian in Love", Peter claims that Angus invented golf. Angus is then seen agreeing with other Scotsmen that they wouldn't allow Jews or blacks to play the game. He bears some resemblance to Mickey McFinnigan, Peter's father, who wasn't introduced for another seven years. This may be due to Family Guy's depiction of Scots and Irishmen.