siblings of Efficient xx

half siblings paternal

stallion Blue Prince xx (Thoroughbred, 1951, from Princequillo xx)

Blue Prince xx

broodmare Stepping Stone xx (Thoroughbred, 1950, from Princequillo xx)

Stepping Stone xx

broodmare Rose Bower xx (Thoroughbred, 1958, from Princequillo xx)

Rose Bower xx

stallion Three Kingdoms (Thoroughbred, 1963, from Princequillo xx)

Three Kingdoms

broodmare Luquillo xx (Thoroughbred, 1961, from Princequillo xx)

Luquillo xx

broodmare Cherokee Rose xx (Thoroughbred, 1951, from Princequillo xx)

Cherokee Rose xx

broodmare Monarchy xx (Thoroughbred, 1957, from Princequillo xx)

Monarchy xx

broodmare Classicist xx (Thoroughbred, 1965, from Princequillo xx)

Classicist xx

stallion Prince Blessed xx (Thoroughbred, 1957, from Princequillo xx)

Prince Blessed xx

broodmare Jack's Princess xx (Thoroughbred, 1956, from Princequillo xx)

Jack's Princess xx

broodmare Milan Mill xx (Thoroughbred, 1962, from Princequillo xx)

Milan Mill xx

broodmare How xx (Thoroughbred, 1948, from Princequillo xx)

How xx