Bob Black Jack is from the first crop of Stormy Jack, a consistent and adaptable runner who won eight of his 21 starts including the Oceanside S. over a mile on the turf at Del Mar and finished second in the six-furlong Los Angeles H. (G3) on the main track. Stormy Jack is by Bertrando, whose own offspring win at an average distance of 6.9 furlongs and is out of Tiny Kristin who won three races, all over six furlongs. Tiny Kristin is by Steelinctive (GB), who was third in the Baldwin S.