I called my mother when I saw your post. My mother's family is from Fronton. I don't know too much to help you out, but maybe this will help some. My mother is related to Santos Barrera. He was her mother's brother. My mother's name is Juanita (Garica) De La Cruz. Paula Perez is my cousin's (Fabian Garcia Jr. from Corpus Christi, TX) grandmother. My mother's cousin, Evita Sandoval lives in San Juan. She is very knowledgeable about the families from Fronton. Maybe I can ask her for more information for you.