Harassment of younger brother by wife

We are 3 members excluding wife of my brother. Me, my mother and my brother. My mother gets pension, me and my brother are govt employee. 2 years ago my brother got married and now has 9 months old baby girl. Since the very beginning his wife started quarreling on trivial issues such as cooking, cleaning, washing clothes etc. I have my room on terrace and I do clean my room and wash my clothes myself . She even gets frustrated to do things for her husband and my 65 yr old mom who have arthritis, BP and many other health issues. My mom and I have never ask her for doing anything . But his wife does not want to do even the usual household chores and ask us to arrange a maid. She wants such freedom as to roaming out, shopping, control over everything in house , to sleep and relax all the time. She doesn't even give a glass f water when my brother reach from office. Rest you can understand. Now she says she wants to do govt job and needs time for preparation and can't do household work at all. At the time of marriage she also told us about her desire to prepare for govt job but then she only showed us her fake personality that she would take care of my mom, husband and whole house . After getting married she only created clash and fight . Now we don't want her to do job. Now she ask to my brother to live separate at another place or give divorce while giving half salary . My brother doesn't want to live separately first because he knows that she needs a queen like life and will only trouble him second he loves his mom. My questions are regarding 1 weather we can file divorce case on ground of harrasment to my brother and my mom . We have audio evidence and all my neighbors have seen her nature and how she lives or behaves and they are eyewitness. 2 can my brother get married again and after how many year 3 what about the alimony 4 we will have to give everything what we got from her side but what about that we gave to her.