Legal rights available to a married woman against domestic violence

My cousin is mentally abuse by his husband and mother in law since 2years.her husband always used to call her mother to complain..he is very aggressive in nature.he always support her mother and his sister but escape to took responsibility of my cousin..he is totally mother boy.he never give money to his wife for her personal expenses..she has a 6month baby ,he is not even love his daughter.usko bus apni maa dikhai deti h.,he has 8brothers and 1 sister,my cousin always kitchen k kamo m hi lagi rhti gmhai fir bhi usko lgta h woh koi kam ni krtihe alwaz insults her.guide me wht step we can take