Gamez-Tobon & Martinez-Trejo

Hello,
I am trying to find my father's family lines. I have been searching for months but can't find anything.

my grandfather is:
Eduardo Gamez
born 1927 in (we think) mexico D.F. but we aren't completely sure. My parents had someone helping them with the geneology back in 2005 who submitted an GEDCOM file into familysearch.org but this info was never verified so we don't know that it is 100% correct.

his father was:
Manuel Gamez Tobon
born approx 1900 my dad said he thinks he is from Tehuacan, Puebla, Mexico NOT Mexico D.F.

his mother was:
Guadalupe Garcia
born approx 1902 but they do not know if she is from Tehuacan or D.F.

My granmother is:
Clemensia Martinez
I found her in the 1930 census in Guanajuato, Jerecuaro, Chahuita and on the census it says they are from Guanajuato.

Her parents are listed as:
Ladislado Martinez born approx 1873.
Tomasa Trejo born approx 1886.

If anyone could help me I would really appreciate it.

Thank you
Julia Gamez Friend