So good to read a response after all this time! It's been difficult getting questions answered from my family, and sadly, those who might have known things are getting on in years.In the "contrato de compraventa" there is nothing to indicate kinship between the Calvos and Verdugos, so your father's recollection is of special interest. Only the women are named as the sellers: Dolores Urrea de Calvo who inherited the rancho from her mother's (Luisa Barragan de Urrea) estate. Dolores must have married a Calvo, but neither her husband's nor her father's names are mentioned. The deceased mother is described as "viuda" and because only her daughter Dolores Urrea de Calvo is named, I have to guess that she, too, was a widow.Perhaps your father remembers names of Calvo wives. As far as location...the rancho, according to relatives, may be in Santa Ana, Sonora, south of Nogales. I see that Alamos is farther south. However it is nearer to Las Cabras, Sinaloa, as well as Guaymas, Sonora, where some of my Verdugos lived in the mid- to late- 1800s. My family moved north to Arizona then west to Los Angeles at about the same time yours did.