I have a person twice - he was married to his sister's daughter.
So I have him and his sister as children of the same father.
Then I have him married to his sister's daughter.
I have probably done something wrong, but please help me to get the record straight, so that he is not two persons.
Thanking you in advance
It can be done with the offline version of FTB.
I was not able to do it via the website.
They really need to fix this
Apparently, one can't marry it's cousin.