The prosecutor's office for Oaxaca state said that all the victims were residents of Córdoba, Veracruz.
The 81-year-old woman is forced to work to help her grandson continue studying.
"El cuerpo presentaba mutilación genital, desfiguración de rostro, y signos de abuso sexual", informó hoy la Federación Argentina de lesbianas, gays, bisexuales y trans, que calificó el hecho como un "aberrante crimen"