St Mark's Basilica is one of two Group 1 winners out of Cabaret (Galileo), winner of the Gr.3 Silver Flash Stakes. The other is his half-brother Magna Grecia (Invincible Spirit), winner of the Gr.1 2000 Guineas and the Gr.1 Vertem Futurity.

Second dam Witch of Fife (Lear Fan) is also the dam of Drumfire (Danehill Dancer), winner of the Gr.3 Solario Stakes, and the stakes winner Ho Choi (Pivotal), second in the Gr.2 Gimcrack Stakes.

Third dam Fife (Lomond) was third in the Listed Lupe Stakes and is the second dam of Ugo Fire (Bluebird), winner of the Gr.3 Park Stakes and second in the Gr.1 Moyglare Stakes. Fife is a half-sister to Piffle (Shirley Heights), dam of Frenchpark (Fools Holme), winner of the Grade 1 Hollywood Turf Cup Stakes, and Pearly Shells (Efisio), winner of the Gr.1 Prix Vermeille.

This is also the family of Mountain Lodge (Blakeney), winner of the Gr.1 St Leger.

Cabaret has an unraced 2-year-old full brother to St Mark's Basilica named Paris Lights and a weanling colt by Kingman.