The ruling on one who commits unlawful sexual intercourse with a woman and then marries her

He also asks and says: If a man has committed unlawful sexual intercourse with a woman for a long period, about a year or more, and after this period he proposed to marry her and actually married her, what is the ruling in that? Is his marriage to her valid? If it is not valid, what should they do after the marriage, given that they have already had children? Please inform us; may Allah reward you.
Answer: The marriage is valid if she has repented from her bad deed; the marriage is valid because a long period has passed for her, and she has exited the waiting period of unlawful sexual intercourse. So the marriage is valid if she has repented and goodness has become apparent from her. Yes.
The presenter: May Allah bless you! And the children?
The Shaykh: The children... yes, they are attributed to him, because the marriage is valid, so his children are attributed to him. Yes.
The presenter: May Allah reward you.