Dear Max M Wihlidal,
I found Gumencindo Yorba and Mary Mansir Yorba's daughter, Mary "Naina?" Yorba married to a Lorella Arbella, in the 1910 Census for the Old Town district of San Diego. Mary Yorba is listed as the head of house's mother-in-law, and a 13 year old niece, Natalia(?)is also listed there.
Mary or Naina Yorba, I believe she died just a couple of years later, 1912.
Do you know much more about this family?
Thanks, Jessica