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« on: Sunday 08 January 23 10:56 GMT (UK) »
Hi and thanks for allowing me to join the group!
This is a bit of a conundrum so I'll try to keep brief and relevant... I'd be grateful for any thoughts or advice.
My partner (OH) and I have both tested on 23andme and Ancestry and then uploaded to MyHeritage. We are from the UK. My parents are both also tested on Myheritage. I have known since being a teenager that my dad was adopted. OH discovered that his dad wasn't who he thought it was about 4 years after him and his sister both did DNA tests. Although my dad had his bio mum's name, he knew nothing about his bio dad. However, I believe I have found my dad's birth family following hours of research. OH also now knows his bio father after his mum eventually gave him a name which was confirmed by DNA matches.
A few weeks ago, something prompted me to look for OH's bio dad in family trees on Ancestry. He's listed in a few trees most of which are private but one public tree caught my eye so I looked to see the connection. However, the person who had created the tree was a DNA match to me! This got me curious so we checked OH's matches and again she was a match to him. In both cases, this person is a distant (5th-8th cousin). We uploaded our samples to Gedmatch and discovered that we share a small amount of DNA (7.1cm) which I realise could be coincidental. We checked our matches on all 3 sites and we are not coming up as matches for each other. However, OH is a match to my dad sharing 12.7cm.
Having downloaded match data from 23andme and MyHeritage and using the highlight duplicates function, we have now found a number of shared matches between myself and OH. The most interesting of these shared matches is FG on MyHeritage. FG's tree is private but they are based in the US. FG and I share 56.1cm across 6 segments with the largest being 15.5cm. OH and FG share 80.9cm across 8 segments with the largest being 20.9cm. Based on these it would appear that FG is a fairly close relative of both OH and I. However (and this is the bit I really cannot understand), FG is not a shared match with either of my parents although FG and I do have a number of matches in common with my dad. How could this be possible? Surely if FG is a match for me, they should also be a match to one of my parents? I realise it is possible to share DNA and not be related but the total amount and number of segments both OH and I share with FG surely make this unlikely. I have been going round in circles for the last few days and have considered all sorts of possibilities including contamination of the samples! I would note that I also have another match on Myheritage who I share 52cm across 5 segments (largest 25cm) who is also not a match to either parent.
Can anyone help shed any light on this? Many thanks in advance and thanks for reading this long post!