Hi, every day is a learning day, I found out things myself last night.
Ancestry Unfiltered match data.
In the Web browser, go to the matches page, then click on the predicted match which is hilighted in blue, (a link I have successfully ignored!). The unfiltered match data is shown there.
You may already have found this.
In the Shared CM tool, if you click on the boxes, you get to a more detailed window, showing the bell curve of the probability of a relationship given a cM value.
The value you give is outside the 99 percentile, but does not mean it is impossible, it may be the original sample size does not capture a real relationship, with 1266 sibling data points, I would need to brush off my school statistics to work that one out!
With Pro Tools you have to be patient, I am going through this process myself, albeit with more distant relatives.
You need to build a DNA tree.
Take the first match, assign it a colour, and a name, this may change as you go through the process. Group 1 will do for this, then add all the shared matches of this person to this group.
If there are close shared matches, look at these and see if you can find the senior person, parent grandparent etc. add this name to the Group name, for clarity.
Then look round for people with trees, the best ones may be children, grand children or cousins, the most interested!
Repeat for the next of your matches unless they are part of the close family of your first group member.
Second and Third cousin matches can be useful for pushing the family back in time especially with big trees.
I have taken to labelling the people with big trees in the Notes, also the parent names of the tester where shown, or worked out.
It saves continuously diving back into their trees.
Reminder it can be a slow process.
And with what you are describing you probably have a tree that looks more like a net with the interconnections!
As you look through, you will work out what is clearest for you.
Happy Hunting