Are you wondering how to tell if an AncestryDNA Thrulines estimate is reliable, or even possible? The Thrulines algorithm works by comparing your DNA matches, their trees, and all the searchable trees in the Ancestry public member tree database. If the algorithm can make your tree and your DNA match's tree connect somewhere, the hypothesis shows up in Thrulines. One problem with this is the many errors in the public member trees database. Also, Thrulines is a computer algorithm, not a genealogist. Sometimes it merges identities that should not be merged. Also, most of us have thousands of matches in...