I'll try to keep this factual but it's a bit of a long one.
Recently I was contacted by someone on Ancestry who has matched to me on DNA. They are the descendant of someone who was transported to Tasmania in 1852. He was born around 1829/1830
I find a petition from someone who says he is the father of the transportee, and the letter (written 1850) is sent from the house of someone in my family tree. The sender of the letter married the widow of my ancestor, in 1845, when they were both in their 50s. Both have children from their first marriages born between 1814-1831
As far as I can see, the person who wrote the letter was married 3 times. Children from the first marriage include someone of the right sort of age, but a different name.
No children from second or third marriages.
My ancestor's children are contemporaries of the transportee, and all are documented through baptismal records.
On that basis, I have ruled out him being the son of either person.
I don't find a baptism record for the transportee with the alleged parents. I do find baptism for all other children.
So, assuming that this person is NOT the son, who could he be? A cousin? A nephew? I don't find him definitively on the 1841 census [he has a very common name ] but do pick him up in 1851 when he's on board a convict ship pending transportation.
I'm struggling to think what lines of enquiry to pursue. The fact that I've picked up as DNA match must mean that the parents or grandparents are in my family tree too, but we just cannot find how we're linked.
Happy to provide more info but as I'm working with the person who's descended from him I don't want to be posting details all over the place immediately. At this point I'm just trying to think if there is anything I have overlooked.