I did a universal search for Martha, Felicia and Chestnut names. I couldn't find Martha in the 1870 or 1880 census using Chest*, In 1870, there were 1,556 Martha in Texas born circa 2 years plus/minus of 1865, 2 Chestnuts, both male. In 1880, there were 10 Chest* Otherwise, some info below that you probably already have:
The 1910 Census showing Robert Robbins and wife Phoene, Myrtle Coleman and John Coleman, were children of David Crockett and Martha. They had a sister Maggie L. Maggie is found in the 1910 Census married to William R Robins(sic), age 38(1871/1872), living in Justice Precinct 1/District 0027, Caldwell Co, Texas. The 1880 census, Karnes Co. shows Robert and William Robbins as brothers; son's of Stark 34 and Elizabeth Robbins. So Myrtle and John Coleman are brother and sister-in-laws due to the wife of Robert's brother, Maggie L.
The 1900 Census of Karnes County, the other poster had a "Mistle Maddie," the census image shows this person as "Myrtle M." The transcription was "Mistle M." There is no "Maddie" on the actual image or the transcription.
The 1910 Census of Justice Precinct 6, Karnes Co.
Julia Coleman, Sister-in-law, age 16, living in the home of
John C Robbins, age 30 and his wife Mattie, 26, married 6 years, two sons/one dau.
--The same 1880 census of the Robbins family shows John Crane, born about 1879. The remaining sibling was Claryssy C, sister, born about 1876.
--I did not find Martha Coleman in 1910, so this "indicates" she had died or had remarried due to illness of Dave. My "GUESS" would be she had died.
The 1910 Census of Taylor County finds David Coleman, a patient in the Epileptic Colony, east half of Precinct 1. He is shown as married 25 years, age 50.
Dave Coleman's burial:http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=co...
Another poster on another message board wrote:
FYI, Texas mandated vital records effective 1903. Compliance with the law lagged for several decades thereafter. Occasionally, I find people who expired in 1950s with no official record of death. There are a scant few death/burial certificates 1903-1920 and none earlier.