siblings of Straight Flush xx

half siblings maternal 9 half siblings paternal 16

half siblings maternal

stallion Secretariat xx (Thoroughbred, 1970, from Bold Ruler xx)

Secretariat xx
gender-male
1970

Bold Ruler xx / Princequillo xx

stallion Sir Gaylord xx (Thoroughbred, 1959, from Turn-To xx)

Sir Gaylord xx
gender-male
1959

Turn-To xx / Princequillo xx

stallion First Family xx (Thoroughbred, 1962, from First Landing xx)

First Family xx
gender-male
1962

First Landing xx / Princequillo xx

horse Stellar Envoy xx (Thoroughbred, 1974, from Bold Ruler xx)

Stellar Envoy xx
gender-female
1974

Bold Ruler xx / Princequillo xx

broodmare Swansea xx (Thoroughbred, 1963, from Turn-To xx)

Swansea xx
gender-female
1963

Turn-To xx / Princequillo xx

broodmare The Bride xx (Thoroughbred, 1969, from Bold Ruler xx)

The Bride xx
gender-female
1969

Bold Ruler xx / Princequillo xx

stallion Somethingfabulous xx (Thoroughbred, 1972, from Northern Dancer xx)

Somethingfabulous xx
gender-male
1972

Northern Dancer xx / Princequillo xx

broodmare Syrian Sea xx (Thoroughbred, 1965, from Bold Ruler xx)

Syrian Sea xx
gender-female
1965

Bold Ruler xx / Princequillo xx

broodmare Loyal Land xx (Thoroughbred, 1967, from Tillman xx)

Loyal Land xx
gender-female
1967

Tillman xx / Princequillo xx