Padrinos

This has been a question to me for a while. Although we are Mormon we still carry the tradition of Padrinoship. for instance mine are my grandfather and his 2nd wife. I have a question. can Padrinos be a brother and sister? Im trying to connect my Angela de Oropesa. In a document, it says "fueron sus padrinos Magdaleno Lopes de Oropesa y Angela Lopes de Oropesa. In our Hacienda any people with the same last name is related. Hence the intermarriage. The Oropesas came to our hacienda around 1890. The ones were named Thomas, Gervacio, Magdaleno and Maria Oropesa. They were said to came after my 3rd grt grandmother came named...Angela de Oropesa who married Jose Maria Hernandez de Solis. And had Eulalia de Solis. Who married Estevan Lopez de Duran who had Lorensa Lopez de Solis who married Celso del Camino y de Soto. Who had Antonio Lopez del Camino who married Maria Guadalupe Vasquez de Elizalde, who had my grandfather Antonio II del Camino. Anyway...The fact is on a relatives baptismal Magdaleno and Angela Oropesa were padrinos, but she cant be married to him because at the same time he was married to Francisca Garcia de Bedoya. So it has led me to believe that Magdaleno and Angela are siblings. Can anyone help? -Daniel Mendez....d. C.