What I know. Born in Hermosillo Sonora circa 1874 - 1880
Married Carmen Moreno in Hermosillo, Sonora and had chidlren
Julio M Zazueta, Carmen M Zazueta de Melgar, Fernando M Zazueta, Manuel M Zazueta, Alicia M Zazueta, Guadalupe Zazueta de Gonzalez, and Maria Eloisa.
Guillermo and Carmen with Children moved from Hermosillo Sonora, circa 1925 to Mexicali. I believe they may have either died in Mexicali or in Tijuana.
I know Guadalupe Lived in Tijuana for sometime and helped raise my grandfather Julio Durazo Zazueta, the son of her brother Julio Moreno Zazueta.