>>936664258
I'd say it is some grade less common than the urge to fuck every attractive women you get in contact with, mostly because you see the little girl from infant to fertile, so you may develop a subconscious will of not ruining her life with incest.
That said, the will of possess and protect another woman of family blood can somewhat tilt the needle in the opposite direction. But as this anon >>936669432 brilliantly pointed out, it's a man made issue mostly, since given the "wrong" (i.e. little to no alternatives) environment, in nature inbreeding happens and no one gives a fuck, like those cat islands around the world or whatever.
And yes mothers develop a sense of jealousy about their daughter that contrast their motherly love and care, in the same way that father's male urges contrast the fatherly love and care.

Also I hate that when someone wants to ask "unaskable" questions elsewhere, there still are faggots parroting morals even on fucking 4chan. One asks, if you get disgusted, go back to your BBC threads and fuck off