Question: Is man intending to take a second wife required to discuss that issue with the first one? Obtain her consent or - inform her about another wife to make her prepared for the new situation?
Answer: No, the religion permits him to have up to 4 wives.
Question: What if a man, who took a second wife, is not fulfiling his obligations towards the first one, neglects her and children, does not support them nor visits them? He violates the rules of a 'just treatment' of all wifes he has. What are the woman rights then?
Answer: He is a sinner for doing this, and she can take the money he is obligated to pay her and the children without his permission.