I have been updated on some information about your search.We are definitely related.
Your great-grandmother is my father's aunt.My grandfather is Manuel Mesa Payan, born near Phoenix in 1888, which was still territory of Mexico,to Nabor Payan & Juliana Mesa.
Today, for some strange reason my father & I sat down and went over some names, he stated that my grandfather had siblings.From what he could remember your great-granmother is one of them.He stated that my grandfather Manuel had an older brother Ramon and sisters Maria, Faustina, Concepcion (Chonita), & Herlinda.From what my father could recall, Maria & Faustina resided in california.Herlinda lived along the Texas/Mexico border.
My grandfather Manuel past away in the 1950's in Ventura, California.He was married to my grandmother Francisca Jurado in the early 1920's.
Their children are sons, [(D) deceased] Lorenzo(D), Antonio, Nabor(D), Guadalupe(D), Manuel, Pedro.The daughters are Eloise, Victoria(D), Virginia(D), Bertha, Elvira, & Julia.
Contact me by email & I can give you my information that I have collected so far.Good Luck.