is there any actual sex with any of the "daughters"
Well, it would be a pretty shitty AVN if not. Play it and see and just skip the dialog to find out (ie skip to choices). That's what I'm doing after I realized the "incest" is fake yet the MC is still being a hesitant pussy about fucking them (I'd fuck my actual daughter in real life if she was wanting to without a 2nd thought and put a baby in her too if she wanted one, fuck what everyone else might think and their opinion of what's right and wrong).