My grandmother, Francisca, was born in1886. Her mother died after having had the one daughter. I found Pedro's name in the book on the historical facts of the Elias family. ( I have a copy). I also found his name and birthplace on border crossings? His birth is listed as 1857 . By the 1930 census, Dolores was a widow . Some of their children we born in Arizpe.

Alberto's info coincides with what I wrote.