In the corner of the ragged photo, the name and location of the inn was written in her father's handwriting.
Her mother… was undoubtedly the demi-human woman her father once loved.
So is this incest or just some weird MTL?
For all you poor confused souls: If a man and a demi-human women have sex occasionally it causes one of them to have a baby especially if they have lots of sex.
If the same man then has sex with a woman lots of times it occasionally causes one of them to have a baby whether the human baby or the demi-human baby is born first is irrelevant.
If the human baby is a boy he is called he and he is the son of HIS father.
If the demi-human baby is a girl she is called she and is she is the daughter of HER father.
If HER father left a picture of his home then it is still HER father not HIS father even though HE is also the son of the same father.
Regardless of the fact that HER father and HIS father might be the same man if your libido can't get past the fact that they may or may not be half siblings (a step sibling is 100% not related a half sibling is 50% related) then you should ignore this game and move to any other of the thousands of games that suit your libido better