How can a child resulting from adultery be attributed to the marital bed when the husband is married, with the possibility of him later marrying the adulterer's daughter, who would be his sister?

Adultery is one of the most heinous and grave sins that incur Allah's wrath, and Allah Almighty has forbidden even approaching it. The wise Sharia has emphasized the matter of lineage, ruling that the child's lineage is attributed to the bed (marital bed), based on the Prophet's (peace be upon him) saying: "The child is for the bed, and for the fornicator is the stone." If a married woman commits adultery and becomes pregnant, the pregnancy is absolutely not attributed to adultery; rather, it remains firmly established for the husband, who is the owner of the bed, because great care is taken to establish lineage. However, if the husband becomes certain, or it becomes overwhelmingly probable to him with strong certainty, that the child is not his, then he must deny it through lian (oath of condemnation).