Guidance for one who dislikes one of his two wives and is hesitant about divorcing her

Question:
After that, we move to Hail and the letter from the questioner (H. K). He says in this question: I am married to two wives. I married the first one without seeing her in the manner prescribed by the Shari'ah, and I was surprised to find that she is not beautiful and is suffering from an illness that is not expected to end. He says: Nine years have passed since my marriage to her, and I am suffering from her defiance and turning away from me. In addition, she is not normal and does not understand matters of life. I kept her in my care out of mercy for her sick condition and her delayed intellect, and also out of affection for my children from her, who are four sons. My other wife is the opposite of that, and I have not been able to be just between them because of my dislike for my first wife. My psychological state is getting worse every day, and I have been hesitant in many situations. I have also hesitated about divorcing her, and she knows about that. Now my psychological state has become severely worse. Should I divorce her? What should I do, O Shaykh?

Answer:
It is obligatory for you to do what is best. If you are able to be just and fulfill the obligatory rights of both wives, then praise be to Allah; strive, be patient, persevere, and fear Allah. But if you are not able, then you must divorce her with one divorce, and you have been patient with her for a long time.
The point is: you should look at what is best regarding her situation and the situation of the other one. If you can be patient with her as you have been patient for this long period, then be patient, and perhaps Allah will guide her and improve her condition. If you divorce her, divorce her with one divorce, and there is no blame on you. Praise be to Allah, you have been patient for a long time. And if you see that it is best to keep her and be patient with her harm and her deficiency, then there is no blame on you in that. Yes.