Hello, I don't have any info on the marriage license but did find a Carnelia Amminda "Nellie" 'Jackson' Roper buried in the 'City of Lubbock' cemetery with a spouse of John Thomas Roper and a child named Aaron Lavanda Roper. Here is the link to the memorial with links on it to the spouse and child. I didn't find anything on the name of Thresher.

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=ro...;