jose simon martinez and or maria rosalia delgadillo

been actively online again searching for jose simon martinez and his wife maria rosalia delgadillo. he was born roughly about 1760 mexico and she also was born about 1765 . their 8childrens name has been found in baptisms through family search . havent found no marriage record or anything pertaining to them yet other than they were at their childrens marriages or whatever. i would like to know who their parents are and where they may have died at. some of their childrens names were jose demasio , maria mauricia etc and were born near san agustin, villa de arriaga, san potosi, mexico