Does a divorce take effect if a man intends to divorce his wife by saying "Go" or "Get out" to her sister? And what is the ruling if a man who has more than one wife breaks an oath of divorce concerning a certain action?

It is advisable to refrain from asking questions about divorce and similar matters that have not occurred and are not needed, because excessive questions of this nature open the door to misgivings and confuse the mind. Overburdening oneself with questions is blameworthy in Islamic law and a waste of time. The Prophet, peace and blessings be upon him, said: "Leave me as I leave you, for indeed, those who were before you were destroyed due to their excessive questioning and their differing with their prophets. So, when I command you with something, do as much of it as you can, and when I forbid you from something, then abandon it." The Companions used to ask the Prophet, peace and blessings be upon him, about actual occurrences that benefited them, not about hypothetical situations or complex issues.