Nysos is out of Zetta Z (Bernardini), who has produced more than one stakes performer.

Second dam Seresa's Spirit (Rahy) is a daughter of Unbridled Elaine.

Third dam Unbridled Elaine (Unbridled's Song) caused an upset in the Grade 1 Breeders' Cup Distaff in 2001, and her half-sister Glitter Woman (Glitterman) was a Grade 1 winner. Three of Unbridled Elaine's five runners won, among them Etched (Forestry), a multiple graded stakes winner who became a sire in Korea, the graded stakes winner Out of Bounds (Discreet Cat) and Emotionless (Shamardal), a Group 2 winner in England.

Elaine's Cat (Discreet Cat), an unraced daughter of Unbridled Elaine, produced Deloraine (Candy Ride), who recently won the Grade 3 Belle Mahone S., and the graded stakes-placed Remuda (More Than Ready).

Zetta Z's younger foals include Warnock (Yaupon), eighth when making his debut over a sprint trip on the Churchill Downs turf on 5 June 2026, the filly Epic Fury (Cyberknife), who is being trained at Turfway Park, and a colt by Justify foaled on 6 March 2026.