What is the jurisprudential status of a child born from an illegitimate relationship, after their parents married following the mother's divorce from her first husband?

You have committed a great sin, one of the major sins, and you must perform sincere repentance. One of its conditions is regret over the sin. This woman corrupted her husband's wife, and "he is not of us who incites a woman against her husband." As for the child, he is not yours; he is attributed to the woman's husband. There is no objection to him staying with you, provided you are careful about adoption. You may care for him, look after him, and raise him well.