Your sons inherited their Y-dna from their father. If you have no living male relatives that you can trace back through male lines to a common ancestor of yours, then I don't think it will work for you. As an example, in the case of my ggg grandmother who emigrated from Ireland in 1853, I would have to find an all-male line descending from one of her brothers to check relationships with possible relatives today. ----- Original Message ----- From: "pat lewis" <carmodyp@bellsouth.net> To: <CountyCork-L@rootsweb.com> Sent: Monday, August 24, 2009 8:41 PM Subject: [CO CORK] DNA question >I have no living male members except my sons, Father died in 1966 , > brother in 1987........... Could either son have the DNA test and what > would it show, how could I make any connection to great grandfather who > died 1905 or any living relative that I know nothing about?