Riotuerto is neither in my CDs nor in FamilySearch.org. Were the parents born also in Riotuerto? If not, why not search for them in cities close to Riotuerto, such as Monte or Navajeda which records, I believe, have been put online by FamilySearch.org. See:https://familysearch.org/search/image/index#uri=https%3A%2F%...
Sorry I couldn't help you.