Hello Lisa,
Does your McDow research include the line of Nathan (1821-1868), son of John, who settled in Erath Co., TX in the mid-1800's? Nathan's brother, James Preston, also went to TX and both of them served in the Frontier Militia. Nathan was scalped by Indians in January of 1868 and his widow, Nancy Ann, lived on in Erath Co. with the children; she is found in Callahan Co, TX in the 1880 census. Nathan's daughter, Nancy Vermillion (my great-great-great grandmother) married John Montgomery Cornelius in 1878. They homesteaded in OK, CO, NM & ultimately CA in 1930.
I've searched off and on for years to discover where in the south the McDow's started as reports vary widely.