She married John William Peyton on 3 Dec 1879 De Soto Parish, LA.  They had issue.
John William Jr.
In 1899, Mary married Robert Austin Lacy after the death of her 1st husband John W. Peyton. She was Robert's first cousin, and 45 years of age at the time of marriage. There was no issue of this marriage. 
She passed away in 1936.
↑ Murrary, Nicholas Russell Computer Indexed Marriage Records for DeSoto Parish, Hunting for Bears, Hammon, LA
↑ Lawler, Hazel. The Stephen Lacy Family of Goochland County, Virginia: With Forebears, Descendants, and Allied Families. College Station, TX: H.E. Lacey, 1998.
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It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her ancestors' 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 (beta) of DNA with Mary: