Thunder Moon is out of the unraced Small Sacrifice (Sadler's Wells), a half-sister to Aahaykid (Intikhab), third in the Gr.3 Horris Hill Stakes. Her produce also includes Table Rock (Fastnet Rock), winner of the Listed Sir Henry Cecil Stakes and later stakes-placed in Hong Kong as Anticipation.

Second dam Trust in Luck (Nashwan) is also the dam of Out of Thanks, a full sister to Small Sacrifice and dam of Love Lockdown (Verglas), winner of the Gr.3 Sirenia Stakes, and of Tiny Petal (Grand Lodge), dam of Vert de Grece (Verglas), winner of the Gr.1 Criterium International.

Third dam Trusted Partner (Affirmed) won the Gr.1 Irish 1000 Guineas.

This is the family of Search For a Song (Galileo), winner of the Gr.1 Irish St Leger, of Dress To Thrill (Danehill), winner of the Grade 1 Matriarch Stakes, and of her full sister Polished Gem.

Small Sacrifice has a yearling colt by Caravaggio.