WIFE LOOKING FOR HER DAD

i am praying that there is someone that can shed some light, my wife is 38 years old was never told who her father was, until recent being at 38 years old heart breaking, the infomation she obtain is his name is Jilberto Nolasco was in a reationship in Iraprato Guanajuato back in 1977 he work as a supervisor at DF federal carrilio for the people, he has a son around 13-14 years of age arounf the year 1978 i have been serching for him not sure if the first name is spelled correctly but i would like to make contact with sibblings on behalf of my wife or even if someone can direct me to research the artchve for the df carrill in guanajuato. thank you and please help me to have my wife reunite her with her family as she is hurt for all the years that have past and noit knowing who her dad was please help to bring this to a closure for her thank you and god bless