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Message: <blockquote data-quote="Wally" data-source="post: 2817624" data-attributes="member: 46212">These tests don't go too far back in terms of markers so you get a general background of ancestry, but that's about it. If you test 15-20 markers, you can pinpoint direct relationships between people. The time-span could be 500-1000 years or more, but each would be directly related to a common male ancestor. (Y-DNA)Sometimes these tests prove a break in the line as well. Large family genealogy groups sometimes find this. For example, John Smith belongs to the Smith Family Genealogy group. He gets his Y-DNA tested and finds that he does not match. Somewhere in the past, another male fathered a child (not a Smith).</blockquote>