Sardina living in Sonora, Mex. area in the late 1800's

My great grandmother was Manuela Sardina Monreal. I was told she had only one sister(which is very unusual for this time and place).I don't know her mother or father's first names(this is what I'm hoping someone could tell me). I only know her maiden name was Sardina and her mother's maiden name was Gastelum or Gastillo? Manuela was born approx. 1890 in Sonora, Mexico area.Her only sister's name was Francisca Sardina who married Ramon Rosales and had at least 5 chidren named, Jesus( born approx.1901), Ramon(1903), Roberto(1906), Rodrigo(1909), and Refugia(1915) of Tucson, AZ. I also know of one decendent, Alexandro(?) Rosales(1st son of Jesus and Encarnacion Rosales born approx.1929). I am looking for any of these children or their decendants. Maybe they can tell me the names of my great-great grandparents (last names, Sardina and Gastelum?)Thanks for any help.God Bless