My challenging ancestor is my 3rd-great-grandmother, Mary Nailor Cossairt. In 1814, she married my paternal-line ancestor, Hendricks (Henry) Cossairt (or Cossart) in Franklin County, Indiana. They eventually settled in Warren County, Ohio, where Mary gave birth to about six children. She died on July 15, 1843, and one source lists her birth year as 1782.
What’s the significance? What’s the challenge? Until her marriage, the Huguenot Cossart family had remained within their blended French, Walloon, and Dutch colonies, starting with the founding of New Amsterdam. They kept together through migrations from New Amsterdam to New Jersey, Pennsylvania, and Kentucky. Pioneer life in Kentucky during the American Revolution was difficult (another challenge), and parts of the family moved north to Ohio. There, they began marrying settlers whose families had emigrated from England, and it’s less clear where these English families originated.
Mary does not appear as herself in any of the early censuses, so where should I look? How could I make something of the scant data? I turned to ChatGPT, feeding it all the information I had—her name, marriage, and death—and let it generate probabilities, leads, and directions. I was able to input information about her first- and last-born children, along with checkboxes from the pre-1850 census records. ChatGPT also prompted me to check later census records (such as the 1880 census) for her children’s details, specifically for their mother’s birthplace.
I discovered another Nailor in the same county in Indiana where Mary was married, as well as another in Warren County, Ohio.
Thanks to ChatGPT, I was able to flesh out more details: Mary Nailor was born around 1792 in Maryland and migrated west before 1814, possibly through Kentucky. She married Henry Cossairt on December 12, 1814, in Franklin County, Indiana, and the young family settled in Warren County, Ohio, where Henry bought a substantial farm in 1821. Mary had six children and died in 1843, around the age of 51. One possible brother, John, about two years older than Mary, lived in Franklin County, Indiana.
The value of ChatGPT lies in its ability to analyze multiple bits of disparate data—such as the early census age/sex checkboxes—and generate plausible conclusions (or dismiss implausible ones) while pointing me in the right direction.
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