 Sonic Lady was not, technically, a Thoroughbred as her female ancestry could not be traced to one of the foundation mares of the breed.She was a product of the half-bred Verdict family, whose ancestry could be traced no further back than an unnamed Perion mare foaled in 1837.So many non-thoroughbreds from this family won major races that the descendants of the Perion mare were admitted to the General Stud Book in 1969 as Half-Bred Family 3.