« Reply #2 on: Saturday 05 July 14 10:03 BST (UK) »
For the Y-DNA test you can go a generation back from William Sr and try to find another male descendant. You will also get an indication from the surnames coming back as matches as to your own potential paternal line. In addition testing autosomal DNA can be used to see if there are relationships on any line, so this would also be useful for you if you can test someone from a line that daughtered out.
Take a look at familytreedna.com and you will get a better indication of what the tests offer. They can pick up matches at quite a distance. As an example I have just found a match between my aunt and my 4th cousin which ties in with paper trail to 3rd great grandparents. However, you have to be aware that a no show on the matches will not necessarily mean that there is no relationship. Well worth considering.
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