Is the son of fornication established as a mahram (a relative one may not marry) like the legitimate son?

The questioner : Is the son of fornication established as a mahram (a relative one may not marry) like the legitimate son? What do you say about this? What is the question? He says: Is the son of fornication established as a mahram (a relative one may not marry) like the legitimate son?

The Shaykh : Yes, he has this status from the father’s side as well. If we suppose a daughter of a fornicator, is it permissible for him to marry her? No, because as we said, the prohibition in marriage is established by the slightest connection.