the closer the match the fewer the possibilities that arise.
I have a 339 cM match and his niece a 167 cM match, with a maternal 2C1R a 145 cM shared match to both.
Although the unknown match has a scant tree from the two names I have been able to ascertain who his father was. This individual had his birth registered twice, initially 2 years late with his mother's surname then much later with his mother's husband's name.
Given the respective ages of the individuals, allied to the fact that both my grandfather's brothers had emigrated to Canada the only solution that fits the known facts is that the unknown is my half 1C, having been fathered by my grandfather shortly after his second daughter was born.
