| Name | Grattan at Law (US) |
| YoB | 1922 |
| Sex | horse |
| Colour | |
| Sire | Grattan Royal (US), 1908 |
| Dam | Daisy at Law (US), 1902 |
| Damsire | Heir at Law (US), 1888 |
| Breeder | |
| Birthplace |
| Colour | Gender | Pedigree | Breeder | ||
|---|---|---|---|---|---|
| 1934 | Goldie Grattan (US) | mare | Grattan at Law (US), 1922 - Thais Direct (US), 1918 | ||
| 1934 | Mary C. Grattan (US) | mare | Grattan at Law (US), 1922 - Smiling Brooke (US), 1927 | ||
| 1937 | Ann Vonian (US) | mare | Grattan at Law (US), 1922 - Margaret Vonian (US), 1928 |