Jeffery S comes from a strong performance lineage, with both his dam and granddam competing successfully with their amateur owners. His dam, My Caissa, boasts championships in the jumper ring and is by the renowned stallion Checkmate, known for his outstanding jumping technique. Checkmate's sire, the Oldenburg stallion Check In, was the 2005 OS Reserve Champion Stallion, earning a final score of 9.08 in his 30-day test, with emphasis on jumping. Check In went on to win a Bundeschampionat qualifier with a score of 9.2 in 2008 and has competed internationally. Check In’s sire, Cordalmé Z, was a top performance horse, winning Nations Prizes and siring numerous successful offspring, including World Cup competitor Couleur Rubin and Olympic participants Careful (Sydney 2000) and Casper (Athens 2004). Check In's dam, Ilonka (sired by Lord Pezi), also excelled in show jumping, competing in the 2005 Bundeschampionat Final. Jeffery’s sire is the popular Jethro Tull G, known for producing offspring with excellent temperaments, trainability, and athleticism. His progeny consistently demonstrate strong form, scope, and power. Jethro’s sire, I’m Special De Muze, is a top stallion from Belgium’s famed Kerly line, producing horses that compete at the 1.60m level. I’m Special De Muze’s sire, Olympic competitor Emerald, is celebrated for passing on scopey, brave horses. In 2020, I’m Special De Muze led the Jumping Index for offspring up to 9 years old. Jethro himself comes from the influential mare line 89, featuring prominent stallions like Voltaire, Heartbreaker, and Ramiro. This line has produced approved stallions and multiple FEI competitors. Jethro brings together the best traits from Voltaire and Heartbreaker, combining exceptional movement with careful, athletic performance. Jeffery S is bred to excel in jumping, with a remarkable temperament and outstanding movement, making him a promising prospect for the right partner. My Caissa’s dam was by the accomplished hunter stallion Oxford, known for his exceptional temperament and athleticism. Oxford competed up to 1.10m and has numerous championships in both hunter and jumper disciplines. His accolades include the Vermont Summer Festival Circuit Champion title and Level 5 Jumper Champion for Nova Scotia. Oxford’s pedigree features five of the top sires in the world: Burggraaf, Landgraf, Voltaire, Furioso II, and Cor de la Breyere, making him an ideal choice for versatility across hunter, jumper, dressage, and eventing disciplines.