Bridgidmac.
In answer to your question about how I did what I did with the five matches in my floating branches.
I set about going through each of my highest DNA matches, selecting the highest, then selecting shared matches and assigning all in the group a Coloured Dot. Then onto the next highest and repeat. At then end I had quite a few with multiple Coloured Dots.
Next I looked at those with multiple Coloured Dots and selected the one with the most people in their tree.
Then I built their Tree in my Tree, checking each person to see if their are any errors in their tree, I went back as far as they had researched and continued with the aim of getting back before 1800 and if I could to 1700.
Then onto the next match and repeat.
Then the next and then the same surname as the previous match was found.
So then I worked concentrating just on the surname. I then found a probable link between the two trees via the common surname.
With a link created I revisited the first match and expanded their tree and found the same surname but not a link to the second and third matches.
So I now had two floating branches of three DNA matches with a common surname. The thing that really stood out was location, Bradford, just as I had presumed would be the case based upon the locations of people in the trees of my DNA matches.
Now for the big one, the 364 cM match, I know her name which I presume is her married name so I searched for a Maureen marrying a guy with the surname of “Lewis” in Yorkshire and found a few so I took a punt on the one with a Bradford marriage. I now had a maiden name, so now I took a sideways break to look at two other matches Susan and Peter who I had thought were Maureen’s children and yes the BMD records showed the Maiden name of Maureen as their Mother. So now I had a tree of three and set about working on Maureen’s parental side and after a couple of generation the common surname came up again.
Then I found a link to two of the three matches above, hence a Floating Branch with 5 DNA matches plus another DNA match who shares the same common surname but one that is not yet linked to the five.
Today I have been using the Leeds Method to build an Excel Spreadsheet snd literary I have only just completed it.
One of the Shared matches to Maureen is also shared with one other DNA match who is not shared with Maureen hence this DNA match is now the centre of research.
As for Grandad not being the child of one of his parents is possible and one that I am going to look into further.
The Floating Branch with the five plus the sixth with a common surname will be revisited again to check each person is valid and this is what I will check after I review the spreadsheet.
More to follow.