Notes for Mary Ann Nelson: The wife of Ross Tatum is reported in the 1900 Chickasaw Nation census as Mary E. Three other sources (which seem to be cross-sourcing or using the same source), give her name as Mary Jane Nelson. Because of other information on the whole Nelson family, the name in these three sources seemed to be the correct form of the wife's name.
However I found the listings for Allen, Oklahoma, Cemetery, where she and Samuel Ross are buried. This has her name as Mary Ann, so I am using that name in the genealogy.
Her birth date varied also, with the three Ancestry World Tree sources reporting the exact date 31 Dec 1882. This seems reasonable. The 1900 census records birth month and year. It appears this was recorded first as Dec 1882, then corrected to Dec 1881. Her age is given as 18. This would match, as she would be 19 (finish her 19th year) in December after the July census.
The grave marker, however, has simply the year, but the year is 1882. This would commonly be taken as authoritative, but in this case it is questionable. First, of all, there is an error also on the birth year of her husband, which differs from the birth month and year reported in the census of 1900. Likewise, for Mary Ann, the census also agrees with the other genealogies on the month and year of her birth.
Thus I have reported her birth date as 31 Dec 1881.
Some sources report a daughter Marie, born about 1921. However, this appears to be a confusion with another Marie (Marie G) Tatum, born to another couple, William and Lydia, in North Keokuk, Lincoln County, Oklahoma. She was also born about 1921, being reported as 9 years old in the 1930 census. I can find no other Marie Tatum at all in the 1930 census.
Similarly, it may be that Sarah, reported in three sources as the oldest child, also belongs to another family. I have not been able to confirm that she is a daughter of Ross and Mary.
Mary Ann's brother William (Billy) married Ross' older sister Sinie.
More About Mary Ann Nelson: Married: 15 Jan 18998705, 8706 Residence: 1900, Township 3, Chickasaw Nation, Indian Territory.8707
More About Mary Ann Nelson and Samuel Ross Tatum: Marriage: 15 Jan 18998708
Children of Mary Ann Nelson and Samuel Ross Tatum are: