Ellen had two sons with her first husband, Joseph Davis. They were Harry Grayson Davis and Joseph Arbuthnot Davis (b. ca. 1894). Her first husband apparently died before 1899, since by the time of the 1900 census she was married to Jack Miller.
Sources
US Federal Census, 1880, Orange, Orange Co., Texas
US Federal Census, 1900, Brenham, Washington Co., Texas
US Federal Census, 1910 & 1920, Elgin, Bastrop Co., Texas
Texas Death Certificate #16518
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DNA Connections
It may be possible to confirm family relationships with Ellen by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Ellen: