Just located information on Anna Isabela Youree. It seems that she married Thomas Nivens on Nov. 5, 1846 and lived in Jackson Co., Missouri. Annie was the daughter of William Hart and Mary Carnahan Youree. This means that there was still another Youree in Jackson County. Armed with this new information, I looked in the "Historic Record of Jackson County, Missouri 1826 - 1876". On page 335, I found that the following were buried in Corn Cemetery: Nivens, Thomas, b. September 15, 1818, d. July 26, 1883; Nivens Annie I., wife of Thomas Nivens, b. May 21, 1827, d. February 8, 1900, age 81 years, 8 months, 17 days; Nivens, David L., b. 1849, died 1925; Nivens, Mary A., wife of David L. Nivens, born 1852, died 1885. Anne Isabela adds weight to the theory that William Hart's mother was Isabela Hart. Atleast we see the name being used. Hope this helps!!!