Can anyone help in locating -Isidro Mercado- this is what I know of him.
He is probably related to the Mercado's that married in to the Orendain family of Magdalena Jalisco and that happened to own the Hacienda de San Andres.
This I suspect because I found a brother and a sister Mercado married to a brother and a sister Orendain.

Maria Luiza Mercado Topete married Joaquin Orendain Camacho on dec. 20 1819 (they are the parents of Zenon Orendain Mercado) Im not sure if he was the owner of the hacienda or there is another Zenon Orendain born before him, what I do know is that one of Maria Luizas and Joaquin Orendain's children were born in the Hacienda.

Jose German Feliciano Mercado Topete married Dolores Orendain Camacho Aug 30 1835

I have a verbal account from his grandson Jose Mercado Avila who passed away last year at 94 yrs of age and this is what he told me:

That Isidro lived and worked in the Hacienda de San Andres, he was a labrador.
That he was married to a Maria Ramos.
That he had a son by the name of Ciro Mercado who was born in 1880 (Jose's father).

I have looked in all the towns surrounding Magdalena with no luck and the only thing
I have been able to find on his son Ciro is a 1930 census of Guadalajara, by that
time he was married to a Francisca Avila of Magdalena and had several children.
This is what the census states:
Francisca Avila-F- 40 yrs.
Nicandro- M-20 yrs.
Julia- F-18 yrs.
Salvador- M-15 yrs.
*Jose- M-13 yrs.
Pedro- M-10 yrs.
Arcadio- M-13 yrs.
Jose Maria- M-10 yrs.