The "Fairy Sisters" were two young girls named Cassie and Victoria Foster, who were advertised as the “smallest persons in the world.” Born in Nova Scotia, Cassie and Victoria toured New England as performers in human curiosity exhibits produced by Fred A. Pickering from 1872 to 1873. In an 1873 issue of the New England Medical Gazette, it was reported, “their ages are six and three; their weight twelve and six pounds…They are well-formed and perfect in every respect, and have always enjoyed good health.” The "Fairy Sisters" exhibit, usually accompanied by a musical performance, showed off their diminutive stature, special clothing, and tiny furniture. The two sisters both passed away at a very young age, only touring for about two years. Their younger brother, Dudley Foster, was also exhibited because of his dwarfism, under the name “Hop-O’-My-Thumb.”

Source:

Nitenson, Sarah, "The Fairy Sisters Ephemera," John J. Burns Library Blog, April 21, 2015. https://johnjburnslibrary.wordpress.com/2015/04/21/the-fairy-sisters-ephemera.