I just came across your post. I have relatives from Durango by the last names of Calderon Saucedo. They owned one of the largest cattle ranches in Durango (do not have the name of the town as of now) in the late 1800's to the early 1900's, until the insurgentes took over several properties in that area.
In order to help you find info. on your relatives I need first names. Thank you.