There is significant uncertainty about the early lineage of Family 17 - see:-
https://www.bloodlines.net/TB/Families/Family17.htm

Family 17, which is still extant, has produced a number of classic and major winners worldwide, those in major racing countries being Cowslip (1785 St Leger), Sancho (1804 St Leger), Meteora (1805 Oaks), the important sire Pantaloon, the outstanding stayer Fleur de Lis (1826 Doncaster Cup), Saucebox (1855 St Leger), Regalia (1865 Oaks), Medeah (1908 Prix de Diane, Prix Royal Oak), Omaha (1935 Kentucky Derby, Preakness Stakes, Belmont Stakes),

Johnstown (1939 Kentucky Derby, Belmont Stakes), Decidedly (1962 Kentucky Derby), and top class racehorse Lyphard (Leading Sire France 1978, 1979, Leading Sire United States 1986, sire of the great Dancing Brave (1986 2000 Guineas, Eclipse Stakes, King George VI and Queen Elizabeth Stakes, Prix de l'Arc de Triomphe)