John T. McKee and wife Mary Pauline Atchley McKee are in Morgan County Alabama in 1850, as is Carroll McKee. Carroll McKee is next door to Joseph Calvert who married Margaret McKee in 1848. Carroll is supposed to be a son of John and Mary, and they are often recorded as having a daughter Margaret born about 1840, which is too young to be Joseph Calvert's wife Margaret, but Margaret doesn't show up on the 1850 census or the 1860 census with her parents. Where did the names of John and Mary's children come from? If they definitely have a daughter Margaret but of unknown birth year, then I'm certain it's the Margaret that married Joseph Calvert.