Kathleen,
I live in San Diego, my dad grew up in Yuma, AZ. I am not sure if Jesus Contreras is related to Piedad Contreras Redondo, but she is my great-great grandmother on my dad's side. She was married to Jose Maria Redondo who is the son of Santiago Redondo and Luz Rodriguez Redondo. Where do you live? I found most of this information either in old papers of my grandma or on the MEXICOARIZONA.com website. Check it out-let me know what you think. Good Luck!! Keep in touch.