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Robert S Cowen, age 41, born in South Carolian
He was alive in 1851 when his father wrote his will, and this appears to be the only reasonable match in the 1850 census.
mentions his wife Jane and children Robert Simpson Cowan, Sheppard Grace Cowan, Amanda Tolbert, Wade Cowan, William Nixon Cowan, Edmund Cowan, Charles Wesley Cowan, and Mary Jane Cason.dated 15 Dec 1851