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« on: Wednesday 21 February 18 01:10 GMT (UK) »
I believe my DNA test may have done exactly this.
My maternal grandmother was born in 1926, and her mother never revealed the identity of the father.
My recent DNA test showed two second cousins in Ireland (309cm over 16), one of whom has been really forthcoming. He told me that he knew his connection with the other guy, their grandparents were siblings, but there was no obvious link with me. The family had stayed in the same region of Ireland for years, and I had no traceable history there.
But then he told me that three great great uncles had moved to Birmingham, were my great grandmother was, in the 1920s. It seems highly likely that one of them is my great grandfather. My mum is doing a test now, just to cut the odds down further.
I don't know if we'll ever be sure which brother it was, there's no-one left in living memory, but it's interesting to research. My new Irish cousin has told me of an ancestor who was a printed author, and things like that I never could have found out through genealogy alone, due to legitimacy.