Was your great-grandfather also Trinidad? My dad's side of the family on his mother's side is Escalante. There were three brothers that traveled to Tucson, AZ from Ures, Son,Mexico. They were Miguel, Manuel, and Trinidad. Their parents were Ramon Escalante and Petra Siquieros. If you belong to Trinidad Siquieros Escalante's side of the family you should know that the family is planning an Escalante reunion for 2006. My e-mail is email@example.com. Hope this helps.