Ok , i have a complete file listing of dna matches. Initially upon receiving my ancestry dna results which show matches. And migrations. Along with trees and surnames attached to my matches , to revisit the core of my research i found , renvilles, rencounter, campbell and just remembered the surname of flood in one or two of those matches. Now. , my question is. Using this file of matches combined with their trees. , is there a possibility of finding out the identity of my second great grandmothers dad ?