Re. de la Torre family

I have been researching my family from Zacatecas. My great grandfather was Manuel de la Torre (1810) married Maria Altagracia Mejia(1815) on Jan. 1833, in Tepetongo. Their children Casimiro de la Torre(1844) and my grandfather Nicolas de la Torre (1846) married Mariana Sanchez(1850) married on April 1875. My grandmother Mariana 's parents were Cornelio Sanchez (1820) and Maria Refugio Ramirez(1822)
I cannot find Manuel de la Torre's parents. I have reached a roadblock. If anyone has info I would appreciate it.