Drawbridge (牝 1934 鹿毛 Sir Gallahad)
 |-- Drawby (牡 1939 黒鹿毛 Diavolo)
 `-- Step Across (牝 1941 黒鹿毛 Balladier)
     |-- Stepping Stone (牝 1950 鹿毛 Princequillo)
     |   |-- High Bid (牝 1956 鹿毛 To Market)
     |   |-- Ways and Means (牡 1958 鹿毛 Ambiorix)
     |   |-- Step On (牝 1959 鹿毛 Nasrullah)
     |   |-- Bold Monarch (牡 1964 鹿毛 Bold Ruler)
     |   |-- Big Advance (牝 1966 黒鹿毛 Bold Ruler)
     |   |-- Some Progress (牝 1969 鹿毛 Bold Ruler)
     |   `-- Intrepid Lady (牝 1970 鹿毛 Bold Ruler)
     |-- Long Stretch (牝 1952 黒鹿毛 Menow)
     |   `-- Stretch Drive (牝 1957 青鹿毛 Bimelech)
     `-- Step Over (牝 1956 鹿毛 Ambiorix)
         |-- Jump Up (牝 1965 鹿毛 Cyane)
         |-- Trial Landing (牝 1972 鹿毛 Solo Landing)
         `-- Over the Stile (牝 1974 鹿毛 Restless Native)