I believe we are researching the same line here! My husband is descended from their daughter Ollie Josephine McGlothlin (b. Mar. 1895) who married William Hutchinson Magill. (One of their daughters, Etter NaOma Magill Herrera just died in July 2003 in El Paso at 88 years old! See http://www.borderlandnews.com/obits/July2003/July20.html
We have a family photograph of 11 of the children, the parents and William's sister. We also have a photograph of William and Ollie Magill.
I'm afraid you probably know more than we do at this point. It's only tonight we've figured out Mattie (Martha's) maiden name and we had no idea of their death dates or burial location. I would love to have whatever information you have and maybe we can lean more together. Right now, I only have the 1900 (Falls County), 1920 (Stonewall County) and 1930 (Eastland County) census records for them. The 1880 and 1910 census records have thus far eluded me.