Missing son of Lamberto de Alba & Librada

My grand father Pedro de Alba (christianed as Jose Pedro) wrote a book of his early years in San Juan de los Lagos, and states that he had a younger brother named "Pablo" (could be Jose Pablo, following church customs) and I can´t find any record of his birth. Only thing I can find is his marriage with Maria Josefa Padilla Gonzalez on the 19 July of 1910 in San Juan.
Being younger, he had to be born after 1886 (date of birth of Pedro), Pablo was a shoemaker and actually showed up as "testigo" in one marriage (can't remember which one right now).
Up to now, I have as children of Lamberto Alba & Librada Perez, the following:
Jose Timoteo, 24/Jan/1882. SJ de los L        (Jose Salvador, 29/Feb/1886. SJ de los L       (220.673)Jose Pedro, 17/Dec/1886. SJ de los L            (220.675)Juliana de la Cruz, 19/Jun/1891. SJ de los L  (220.677)Maria Catalina de los Dolores, 1/May/1894.    (220.678)Jose Leon de Guadalupe, 11/Apr/1899.           (220.680)Francisca Engracia, 3/Apr/1901.                      (220.681)Maria Camila de Guadalupe, 15/Jul/1904.        (220.682).
If anyone can give a clue as to where to search, I would greatly appreciate it.

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Abraham de Alba Avila
Terrestrial Plant Ecology, Permaculture and Holistic Management & Low Stress Animal Handling SKYPE: adealba55  cel: 449-100-9966