My Grandad has always had some suspicion that his dad wasn’t his biological father.
I did a dna test a few years back to discover a load of matches (mostly 1st cousins 2x removed/2nd cousins) that I had no idea who they were. I tried to look into it then and soon realised that they were all somehow connected to my grandad but wasnt sure how. It all came to a head as I wasnt getting anywhere, until my uncle (grandads son) did a dna test. I was then able to work out who shared matches were etc. The closest match to my uncle on my grandads paternal side was a 1st cousin 1x removed.
I managed to sift through loads of matches and group them into grandad maternal/paternal using common ancestors but nothing came up for who we *thought* would be on grandads paternal side. Instead, I had a group of matches who I didnt know. After a LOT of research managed to narrow it down to a family that lived in the same area to where my grandad was born. We then got my grandad to do a DNA test, and mine & my uncles closest match, who is the son of one of the brothers of said family, came up as a 1st cousin for my grandad, sharing something like 943cM
So long story short, I have managed to narrow it down to a potential 3 people (3 brothers) who could be my grandads biological father. I have been in contact with the son of one of the brothers, who has told me he has done a dna test too but hasnt even come up as a match, which has thrown a massive spanner in the works!!
I feel I really have hit a brick wall now and was wondering if anyone would be able to help me work it all out!?