I don't know if anyone is still watching this feed or not but my mother was a Donham and there are several Donhams buried in Covington Cemetery in Covington, Texas.
If you go to findagrave.com and type in Covington Cemetary, and then Donham in the name search it will list all of the Donhams' buried there and when you click on a name you will see detailed info about spouses, children, parents & siblings.

Hope this helps
Rebecca