Geschwister von Gray Billy Mare

Halbgeschwister Vaterlinie

Deckhengst Whalebone (Quarter Horse, 1868, von Old Billy)

Whalebone

Deckhengst Martins Cold Deck (Quarter Horse, 1868, von Old Billy)

Martins Cold Deck

Deckhengst McCoys Billy (Quarter Horse, 1872, von Old Billy)

McCoys Billy

Deckhengst Anthony (Quarter Horse, 1867, von Old Billy)

Anthony

Deckhengst Pancho (Quarter Horse, 1886, von Old Billy)

Pancho