siblings of Summerhill II xx

full siblings 1 half siblings maternal 1 half siblings paternal 8

half siblings paternal

broodmare Shadow Proof xx (Thoroughbred, 1943, from Unbreakable xx)

Shadow Proof xx
gender-female
1943

Unbreakable xx / Sir Gallahad III xx

broodmare Pandora xx (Thoroughbred, 1947, from Unbreakable xx)

Pandora xx
gender-female
1947

Unbreakable xx / Display xx

stallion Polynesian xx (Thoroughbred, 1942, from Unbreakable xx)

Polynesian xx
gender-male
1942

Unbreakable xx / Polymelian xx

broodmare Sturdy Miss xx (Thoroughbred, 1949, from Unbreakable xx)

Sturdy Miss xx
gender-female
1949

Unbreakable xx / Victrix xx

horse Durability xx (Thoroughbred, 1942, from Unbreakable xx)

Durability xx
gender-female
1942

Unbreakable xx / Teddy xx

broodmare Femme Noire xx (Thoroughbred, 1948, from Unbreakable xx)

Femme Noire xx
gender-female
1948

Unbreakable xx / Pompey xx

broodmare Broken Star xx (Thoroughbred, 1949, from Unbreakable xx)

Broken Star xx
gender-female
1949

Unbreakable xx / Heliopolis xx

broodmare Adamantine xx (Thoroughbred, 1949, from Unbreakable xx)

Adamantine xx
gender-female
1949

Unbreakable xx / Eight Thirty xx