Mackey is the youngest brother and the only one still chasing his first Iditarod win .
Jason Mackey of Wasilla is a member of the storied Mackey mushing clan that contains three champions in two generations .
Mackey is the youngest Mackey and the only one still chasing Mackey 's first Iditarod win .
Jason Mackey of Wasilla is a member of the storied Mackey mushing clan that contains three champions in two generations .