iirc early on the game ask the player if the two of them are blood so if you didn't choose yes then this sounds like a minor glitch
also
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I think I would recall if the game asked me if they are blood related. If it did then I am either blind or it was not properly explained what I was agreeing to. Either way what I remembering seeing was to write something in and I had several opportunities if I didn't like the defaults.
Unless the game somehow recognizes the things you write in and some kind of flag switches accordingly, that should not be possible.
Yeah no, there was no option, only. No one to define blood relations. Genex has it, not this one. If you know what kinds of words entered manually would change the dialogues then let me know and find me an easy dialogue comparison. Either way I don't mind keeping it that way.
Also I pretty much went with the defaults recommended by the pages where you write in their relationships, so that would be Cousin, Cous, Aunt, Nephew etc.
That second from the dropdown menu in the pic you provided only shows options to write in their relationship. It never once asks you if they are blood related or not.