siblings of Headstrong xx

half siblings paternal

broodmare Saddlemark xx (Thoroughbred, 1917, from Polymelus xx)

Saddlemark xx

stallion Invincible xx (Thoroughbred, 1914, from Polymelus xx)

Invincible xx

horse Humorist xx (Thoroughbred, 1918, from Polymelus xx)

Humorist xx

stallion Maiden Erlegh xx (Thoroughbred, 1909, from Polymelus xx)

Maiden Erlegh xx

stallion War Cloud xx (Thoroughbred, 1915, from Polymelus xx)

War Cloud xx

broodmare Cresta xx (Thoroughbred, 1912, from Polymelus xx)

Cresta xx

broodmare Dew of June xx (Thoroughbred, 1913, from Polymelus xx)

Dew of June xx

stallion Saigon xx (Thoroughbred, 1915, from Polymelus xx)

Saigon xx

stallion Poltava xx (Thoroughbred, 1917, from Polymelus xx)

Poltava xx

stallion Dominion xx (Thoroughbred, 1916, from Polymelus xx)

Dominion xx

stallion Parth xx (Thoroughbred, 1920, from Polymelus xx)

Parth xx

broodmare Merry Polly xx (Thoroughbred, 1956, from Polymelus xx)

Merry Polly xx