Claim: Marcus Allen's male sibling was born in 1963.
Evidence: His younger brother , Damon Allen , played quarterback for 23 seasons in the Canadian Football League and was professional football 's all-time leader in passing yards.
Damon Allen -LRB- born July 29 , 1963 -RRB- is a former professional quarterback who played in the Canadian Football League.
A brother is a male sibling.