Salaam Aleikum wa Rahamatullah wa Barakatu. I have a question...obviously hence the title. My wife and I know this non-Muslim man whom is her sister's father. They have two different fathers, my wife's real father is a known child molester so she has no relations with him. We have only known this man for less than a year. My wife refers to him as her father, he is not married to her mother by the way, she is married to another man. My dilema is that he has been very disrespectful and tries to get me to answer to him but I do not. I know that it is my right in Islam to keep him away from my family. However this will likely hurt my wife's feelings. I would greatly appreciate advice on how to go about this along with anything from the Qu'ran and Hadith Inshallah. Private messages are also welcome. Jazakallah Khair.