If he is a Muslim, then the marriage is correct, because there is nothing upon him of the sin of his mother and the man who committed adultery with her, according to the Words of Allaah, Most High:
“That no burdened person (with sins) shall bear the burden (sins) of another.” An-Najm 53:38
- and because there is no shame on him, if he goes straight on the religion of Allaah and if he models himself on standards of behaviour which are pleasing (to Allaah), according to Allaah’s Words:
“O mankind! We have created you from a male and a female, and made you into nations and tribes that you may know one another. Verily, the most honourable of you with Allaah is that (believer) who has At-Taqwa [ i.e. he is one of the Muttaqoon (the pious) ]. Verily, Allaah is All-Knowing, All-Aware.” Al Hujuraat 49:13
- and the words of the Prophet Sallalaahu alaihi wa sallam, when he was asked about the most noble of people, he said:
“the most pious of them…” - and he sallalaahu alaihi wa sallam said: “Whoever was slow in performing (righteous) deeds, his lineage will not avail him.” Muslim no. 2699.
- and it was reported that he Sallalaahu alaihi wa sallam said:
“If one whose religion and character pleases you proposes to you, then marry (your daughter to) him. If you do not do so, it will be a cause of trial in the land and great corruption.” At-Tirmidhi no. 1084.