Mixed feelings about this one.  I'm definitely not into incest, would have been nice if they were all in-laws and unrelated.  That said, and dismissing the incest, a very well written and interesting story.

Your attention to detail is exceptional.  Your unorthodox original concept is worth note.

Except for a few references to her dad as "mom" and her", your grammar is exquisite.

Very well done {well, minus the incest; but that's just MHO}.

Looking forward to reading more of your work.