A man reviling his wife and son for worldly matters they did which he thinks to be wrong

Q 1: My paternal grandfather insults my father and grandmother for worldly matters thinking that they are wrong. Many times, the neighbors can hear his loud voice and he may say some private matters loudly but he does not care about that. At times, he threatens that he will kick us out of the house. He is illiterate and knows only about farming. He does not accompany people even the righteous ones. Although he performs Salah (Prayer) regularly at its due time, it is like the peck of a cock i.e. improper and lacks serene submission. If we talk to him, he turns deaf ears to us. Kindly point out how we should deal with him. May Allah bless you.

A: You should deal patiently and benevolently with him. Do not expect him to reciprocate the same kind of treatment, but you have to teach him how to perform Salah in the prescribed manner. We ask Allah to guide and help you deal with him.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.