ANSWER:

You must not say a word and simply not be in the same place and when he is in a good mood, talk about the major sin of being disrespectful to parents without taking his name, with diplomacy, wisdom and knowledge. 

If my husband is shouting on my mother in law in front of me with words like, “use your brain otherwise don’t irritate me, you are brainless and so our maternal relatives”, as his wife, what should i do? And if i don’t say anything because of the fear that my husband might fight with me, am i wrong? Please help.