siblings of Spartan Boy xx

half siblings paternal

horse Arabis xx (Thoroughbred, 1951, from Hyperion xx)

Arabis xx

broodmare Transparent xx (Thoroughbred, 1946, from Hyperion xx)

Transparent xx

stallion Gulf Stream xx (Thoroughbred, 1943, from Hyperion xx)

Gulf Stream xx

stallion Hyperides xx (Thoroughbred, 1939, from Hyperion xx)

Hyperides xx

broodmare Hastra xx (Thoroughbred, 1942, from Hyperion xx)

Hastra xx

broodmare Merry Perrin xx (Thoroughbred, 1942, from Hyperion xx)

Merry Perrin xx

stallion High Veldt xx (Thoroughbred, 1953, from Hyperion xx)

High Veldt xx

broodmare The Satellite xx (Thoroughbred, 1946, from Hyperion xx)

The Satellite xx

broodmare Helianthe xx (Thoroughbred, 1955, from Hyperion xx)

Helianthe xx

broodmare Phaetusa xx (Thoroughbred, 1937, from Hyperion xx)

Phaetusa xx

broodmare Sonsa xx (Thoroughbred, 1953, from Hyperion xx)

Sonsa xx

broodmare Red Ray xx (Thoroughbred, 1947, from Hyperion xx)

Red Ray xx