The Index of Vital Records for Texas shows the names and dates you have for both marriages and divorces for Patricia.
Marriage and divorce records regarding Oscar both in Harris Co, TX.
Both records for Ronald are in Tarrant Co, TX.
Go to RAOGK (Random Acts of Genealogical Kindness) site -- http://www.raogk.org/faq-requesters.htmhttp://www.raogk.org/faq-requesters.htm -- There is at least one volunteer for each of those counties who will do vital record look ups. You want them to check the marriage APPLICATIONS (not the license, not the certificate) The Application is the record where names of bride and groom, age, residence, the names of their parents and other information is recorded.