What is the ruling on one who does not treat his wives and children equally?

Question : Shaykh Muhammad, this sister who is asking actually has two questions. In the first question, she says that her father has three wives, but this father does not treat them equally. Some of the daughters ask for money, and he does not give it to them; he favors some over others. This questioner says, "I hate him, even though I serve him." She says this despite the fact that he is the imam of one of the mosques, a mosque where he leads the people in prayer as the imam. So what is your guidance, may Allah preserve you?

Answer : If what this questioner says is true, then this husband is a sinner. He is committing a major sin among the major sins. Because the Prophet (peace and blessings be upon him) issued a warning.
For the one who does not treat his wives equally, he said (peace and blessings be upon him) . We will come to this description. In the place where Allah gathers the first and the last. What a disgrace and what a wretchedness that is.
This man should fear Allah for himself first, and for his family second. Let him repent to Allah for what he has done. Let him treat his wives equally in everything in which he is able to be equal. And let him not prefer one of them over another.
Likewise, it is obligatory for him to be just among his children by giving each of them what he needs, and not preferring one over another, for that is injustice. And the Prophet (peace and blessings be upon him) said . And if this man
is the imam of the Muslims in prayer, then he bears a greater responsibility than others, because if Allah the Exalted has given him knowledge, He will ask him about acting upon it. Let him and others whom Allah has given knowledge remember the saying of the Prophet (peace and blessings be upon him): "The Qur'an is an argument for you or against you," and let them beware that the Qur'an becomes an argument against them.