I know that you may be interested in DNA testing and I just received an email from Crispin Rendon on this subject. This email is very short but contains a link to a PDF document that I know you will find interesting.
My name is Moises and welcome to We Are Cousins, a blog dedicated to South Texas and Northeastern Mexico Genealogy. It's primary purpose is to educate and provide its readers with resources to locate their ancestors, whom at one point lived in this area. To read more about me or my other projects visit my personal website moisesgarza.com