What should I do if my wife does not agree to me marrying another woman, and what is the ruling on confronting her with the sins she has committed, and is it permissible to marry secretly without the family's knowledge, and what should I do if the sister does not agree to the marriage?

You must offer sincere repentance for what you did with that woman, while concealing your sin and not informing your wife or anyone else about it. Marriage to that woman is not a condition for repentance. However, if you are able to be just between them, and you can convince her to marry you, then you may proceed with that, exercising wisdom to ensure the family is not disrupted.