Is a husband entitled to prevent his wife from mentioning the biography of her deceased fiancé in his presence, due to his jealousy over her, knowing that her deceased fiancé is the brother of her sister's husband, and that they had a child named after the fiancé?

Jealousy is of two types: praiseworthy when there is suspicion, and blameworthy when there is no suspicion. The Prophet, peace and blessings be upon him, said: "Of jealousy, there is what Allah loves, and of it, there is what Allah despises. As for what Allah loves, it is jealousy in suspicion. As for the jealousy that Allah despises, it is jealousy when there is no suspicion." Ibn Taymiyyah mentioned that obligatory jealousy is that which involves forbidding what is disgraceful, and recommended jealousy is that which necessitates what is recommended in terms of protection. As for jealousy when there is no suspicion, Allah does not love it. It is the husband's right to prevent his wife from speaking about the life of a non-mahram man because it might lead to corruption.