Jack d'Or is out of Ravarino (Unbridled's Song), a dual winner at 1m2f in 2007, and is the 31st Group 1 or Grade 1 winner from a mare by Unbridled's Song. The mare has ten foals of three years or older, and six more of them have won in Japan, though none at stakes level.

Second dam Sous Entendu (Shadeed) was third in the Gr.3 Prix de la Grotte in 1990. At stud she produced Slip Stream (Irish River), a Listed winner who was third in the Gr.2 Dante Stakes and also won a Group 2 race in Germany, Porte Bonheur (Hennessy), twice a graded winner in the US, and Banafsajee (Pleasant Colony), a dual Listed winner in France and dam of the Listed winner Banksia. She is also the grandam of Alverta, a Group 1 winner in Australia, and of her Group 3-winning half-sister Aerobatics.

Third dam It's in the Air (Mr. Prospector) was champion 2-year-old filly in America in 1978 and won five Grade 1 races. Her nine winners include Bitooh (Seattle Slew), a Group 2 winner in France, and the Listed winners Air Dancer (Northern Dancer) and Monaassabaat (Zilzal).

Further back the family includes State of Rest (Starspangledbanner), a Group 1 and Grade 1 winner in several countries, the multiple Group 1 and Grade 1 winner Storming Home (Machiavellian), Musical Chimes (In Excess), winner of the Gr.1 Poule d'Essai des Pouliches, the Group 1 winner Glencadam Gold, and Music Note (A.P. Indy), who won five Grade 1 races and is the dam of Mystic Guide (Ghostzapper), winner of the Gr.1 Dubai World Cup and now a sire.

Ravarino is represented by the 3-year-old colt Crown Romagna (Daiwa Major), who has raced once, the 2-year-old filly Marino El Dorado (Rey de Oro) and a yearling full sister to Jack d'Or. She is due to Maurice again in 2023.