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On behalf of my (half) sister I am endeavouring to to track down her father, or at least a name. Let me just call him AA for want of a reference. Through the DNA Heritage site we managed to find someone with a high DNA count who was a great help. We got information which took us back 3 generations to a time when (AA) age wise, was a possibility. However there was no way of finding out if AA and our mother ever crossed paths. If they did it would have had to be between June and August 1941 Our mother came from the Aberdeen area, (and to our knowledge never left ). AA was from the Airdrie/ Lanark area. I'm treading warily here by not posting names. I have investigated his family but he had only one brother who was older and produced a family who were static in the Lanark area.  There seems to be other threads from different people, who one way or another have ancestors with AA’s surname, and possibly links. The DNA percentage count between AA’s gt grandson and my sister was 7.5%. Given that a recently discovered niece shares 12.5%, on our mother’s side, this seems to indicate that an ancestor 3 generations back could have easily have had 50% DNA.
AA was in the Army during WW2 but without access to his records, I cannot even guess if he was ever in the North East of Scotland. I am led to believe I can access these Army records 115 years after his birth. That would be next year.
So any suggestions as to how we could proceed given that the few tenuous links we have garnered from the DNA Heritage site seem to dry up as soon as difficult questions are asked.

Thanks for the info still not sure as to when or where John duff was born. Are the kirk sessions available now on Scotlands people? They might be handy in trying to find the origin of my "brick wall" gt gt grandfather Young. I live in hope.

John Duff was married to Anne Kellas on 12 July 1827.I cannot find a DOB for him, but I'm guessing he died sometime between 1846/47 and 1851. He appears in the 1841 census but not in the 1851. On that his wife is a widow. I have tried Scotland's People, but it looks as if he just disappeared. Any suggestions or perhaps someone in his family has the answer. I live in hope.

Hi "drew" well done, I had not investigated  Andrew's father. Also  have never seen that before in a death certificate though. Excellent, still wondering where he might be buried though, might investigate where George the father is buried in the event his son could be in the same lair. Good work thanks.
Lochnagar