Can I file case against a lady who abuse me and my mother

Hi My brother got in touch through social media with a lady and they were in living relationship. His intention was good and was planning to stay with her. But later he came to know that she had many relationship apart from this and hence he thought about leaving. From that time this lady took mine and my mothers number from my brothers number and start abusing as through calls and messages. My mother is above 60 and she is in a trauma by this incident.. Last day that lady came to our home and was abusing my parents and brother. My grandfather who is 96 is a heart patient and he is much worried just like my father and mother. She even says my brother is not born for my dad and she abuses my mother very badly. My brother, no longer like to continue that relationship. When lady came to know, my brother is not interested in this, she is filing case for domestic violence against my brother. Even she called his office and informed management and brother was asked to go out from office. What can we do for this?? Please help...