siblings of Brighton Rock xx

half siblings maternal 2 half siblings paternal 17
  half siblings maternal (2)
  half siblings maternal (2)
  half siblings paternal (17)

half siblings maternal

broodmare Queen's Rock xx (Thoroughbred, 1951, from Souverain xx)

Queen's Rock xx
gender-female
1951

Souverain xx / His Highness xx

broodmare Thetis II xx (Thoroughbred, 1957, from Guersant xx)

Thetis II xx
gender-female
1957

Guersant xx / His Highness xx