I've been having a lovely email conversation with two of my DNA matches.
Their great grandfather in some online trees has become confused with a first cousin of his with a similar name.
One of my matches has been messaging with a lady that has this great grandfather with the wrong parents in her tree. This lady responds to all messages and chats away about all things family history but her tree remains uncorrected.
Between the three of us we have a fairly solid paper trail and we have attached records to our respective Ancestry trees. I have attached to my public tree an image of the marriage of the first cousin showing clearly the correct father. One of the witnesses is the brother of this first cousin and these brothers can be connected to the correct parents with census and BMD indexes.
I have spent this afternoon roaming around this other lady's public tree and I have concluded that she doesn't actually feature in the tree herself but may be an aunt of the "home" person.
Assuming that there are no further errors in this tree I think that the "home" person might be.....
The fourth cousin twice removed to the wife of the first cousin of the half brother of my grandfather.
Should she be on my Christmas card list?

I love this hobby.
Tony.