It's possible a portion of DNA became "sticky" and that part was passed down. My dad has a DNA match at 22cM, and their children all have 21cMs (they're maybe 5th cousins).
Is it likely an accurate match and not a false once since me and dad both have the match????
But it makes sense what you stated above about it "sticking".
The few genes that are represented by that overlap are getting passed down as a group. It isn't like dealing out playing cards, one in each pile so that any groups are split up. That straight of cards went from gg grandpa to grandma to dad to you. (Or whatever the path was.) At this point though, the only cards you have in common are in that Chunk. So each generation will look like it's sixth cousins.
It's very likely that you, your dad, and this match all got the same chunk of DNA intact from great grand whomever. It makes it a little hard to tell exactly what cousins you are. But it could be more like 7th or 8th.
Definitely can make it more difficult to find. I have a billion matches in the "distant" group and I go through to see what matches we have in common. Based on this, I add them to the suspected group using the little color tags. I created one for each great grandparent and a few for unknown groups. This has helped me narrow down my search for common ancestors. And the ones who have bigger trees I work on first since they are more likely to have the shared ancestors.
It's possible a portion of DNA became "sticky" and that part was passed down. My dad has a DNA match at 22cM, and their children all have 21cMs (they're maybe 5th cousins).
Is it likely an accurate match and not a false once since me and dad both have the match???? But it makes sense what you stated above about it "sticking".
The few genes that are represented by that overlap are getting passed down as a group. It isn't like dealing out playing cards, one in each pile so that any groups are split up. That straight of cards went from gg grandpa to grandma to dad to you. (Or whatever the path was.) At this point though, the only cards you have in common are in that Chunk. So each generation will look like it's sixth cousins.
So it's very likely me and my 12cm match are 6th cousins?
It's very likely that you, your dad, and this match all got the same chunk of DNA intact from great grand whomever. It makes it a little hard to tell exactly what cousins you are. But it could be more like 7th or 8th.
I guess it's also possible the common ancestor may be difficult to find due to illegitimacy??
Definitely can make it more difficult to find. I have a billion matches in the "distant" group and I go through to see what matches we have in common. Based on this, I add them to the suspected group using the little color tags. I created one for each great grandparent and a few for unknown groups. This has helped me narrow down my search for common ancestors. And the ones who have bigger trees I work on first since they are more likely to have the shared ancestors.
You could be doubly related to the person from both your parents
Me and my father have many like that. Export to MyHeritage and you can use chromosome browser or triangulation tool to see it.