Is it permissible to inform the husband's father of his daughter's behavior, after the wife discovered her husband's niece in an indecent situation with a strange man in her apartment, and the subsequent humiliation and accusations from the husband's sister, and the husband's believing his sister instead of his wife?

According to Islamic law, it is required to conceal the sins of those who commit them secretly and do not publicize them, and some scholars consider this obligatory. Therefore, the questioner should conceal the matter concerning the woman in question and not inform her father or anyone else about what happened, especially since there is no benefit in informing the father. She should entrust her affair to Allah, be patient, and trust that Allah will not abandon her, in accordance with His, the Almighty's, saying: "Indeed, he who fears Allah and is patient, then indeed, Allah does not allow to be lost the reward of those who do good" (Yusuf: 90).