In modern literature there are many examples of incest.
Incest is presented in the plots of many books.
Of course it is not in its classical form as it is in Oedipus legend. The form is changed but incest as such can be recognized . Here are two excerpts to display the latter. One is from Nabokov's Lolita, the other is from Thackeray's Vanity Fair. Her age ia twelve.