Several years ago someone claimed my 2g grandfather as their own. I could live with that if anything else matched after his birth ie wife, children, what country he lived in. I understand why they picked him as I honestly can't find them an alternative either. But they are still wrong and I still mutter (loudly) under my breath about it.
Today I just discovered someone has claimed my 3g grandmother, her husband and children. Different line to 2g grandfather. I was a little bit excited as I have no contacts for this branch and she was a difficult woman to unravel. This new person has even posted photos of her and her son online!!
However, they too, are wrong.
The worst thing is FMP have most of the parish records online for this family so no certificates are needed. To top it all off they don't even have my 2g grandma listed as a child and I'm a bit partial to her as she also proved rather difficult to sort out so I spent more time on her than I do most people.