MacAndrew's grandson Donald Jock MacAndrew (Jock's son), became a thoroughbred horse jockey. He rode "Saggy", the horse that famously defeated the previously unbeaten Citation (ridden by Eddie Arcaro) in the Chesapeake Trial Stakes at Havre de Grace Racetrack on April 12, 1948. The Baltimore Sun called it "The horse racing upset that stands for the ages".
