siblings of Devil's Thumb xx

half siblings maternal 1 half siblings paternal 7

half siblings paternal

horse Lydia xx (Thoroughbred, 1944, from Grand Slam xx)

Lydia xx
gender-female
1944

Grand Slam xx / Sweep xx

stallion Piet xx (Thoroughbred, 1945, from Grand Slam xx)

Piet xx
gender-male
1945

Grand Slam xx / Blue Larkspur xx

broodmare By Me xx (Thoroughbred, 1946, from Grand Slam xx)

By Me xx
gender-female
1946

Grand Slam xx / Pharamond II xx

broodmare Extra Tricks xx (Thoroughbred, 1945, from Grand Slam xx)

Extra Tricks xx
gender-female
1945

Grand Slam xx / Supremus xx

broodmare Grand Mary xx (Thoroughbred, 1941, from Grand Slam xx)

Grand Mary xx
gender-female
1941

Grand Slam xx / Clock Tower xx

broodmare Contenta xx (Thoroughbred, 2007, from Grand Slam xx)

Contenta xx
gender-female
2007

Grand Slam xx / West Acre xx

broodmare Grand League xx (Thoroughbred, 1945, from Grand Slam xx)

Grand League xx
gender-female
1945

Grand Slam xx / Bubbling Over xx