What is the ruling of Islamic law regarding the dispute between two sisters caused by the husband of one of them, who insists on ignoring his wife's brother and demands an apology despite previous attempts at reconciliation, and am I obligated to apologize despite feeling humiliated?

The verse encourages repelling evil with good, so that an enemy may become a friend. We advise the questioner to resolve the dispute with his sister’s husband out of respect for his sister. Umar (may Allah be pleased with him) said: “You have not punished someone who disobeyed Allah concerning you with anything better than obeying Allah concerning him.” Humility and forgiveness increase a man’s status, and “whoever humbles himself for Allah, Allah raises him.” It is not permissible to abandon someone for more than three days.