What is the ruling on doubting the wife’s morals due to her mother’s past behavior, knowing that the wife has been separated from her mother since childhood and is religiously and morally committed? What is the Islamic legal position regarding the wife's mother if she appears in their lives? Is it permissible to be pessimistic about the wife due to the difficulties the husband has faced since the engagement?

There is no authentic hadith that states "the daughter takes after her mother." Weak hadiths or proverbs that mention this are not to be relied upon. A daughter must honor her mother and treat her kindly, even if the mother is not righteous. A wife should not be prevented from doing so unless there is a fear of her corruption, in which case communication should be limited to inquiries and phone calls. The default state for Muslim women is chastity. Pessimism regarding one's wife and superstitions are acts of shirk. If ill omens are attributed to a woman, it usually refers to her not bearing children, her sharp tongue, or her being exposed to suspicion. If the wife is not like that, then it is advisable to keep her and disregard such misgivings.