Brother and his Wife mentally harassing to my family and mother

My brother got married on 5 June 2008 in pune, next day newly married couple went to there new home on 6th june 2018 in pune .After one year both are came back and on little little things she started shouting,fighting and said foul languages against him and said that we are making her do a lot of work like a maid,tried to insult her..from that day on wards my brother and his wife started creating mental pressure on my mother and me( I am elder brother)..they gave thread that they will file a false dowry case (never asked any single penny have a proof as they gave statement for what they have given to us by their own) or foul statement against us then both are shifted to new mumbai for job purpose Second time both are again back to our home when my father was expired .She threatened us again and again..this is creating a mental pressure on all of us. insulted my whole family by attempting false statement.we tried to stay away from them as per the law Females case is given much preference.Again few days later, in the month of May 2018.They were continuously putting pressure on us and said wrong words and disrespected my whole family... it was a pure mental harassment on us.My brother and his wife came to pune from new mumbai and physically hurt my mother so we decided to file police complaint in pune commissioner office for safer side. We filed complaint in Mahila Sahayata Kendra (Ladies Help Center & Senior Citizen Help Center). Pune Commissioner office called them for counselling but they didn't came. Today I received call from Mumbai police that both are filed complaint against me and my family and police called me to mumbai.will you pls guide me what suppose to my line of action?