Mental harassment to my parents

My brother and his wife have been mentally harassing my parents and I since they've stepped in. It started with small disrespects. Before marriage her parents and uncle said she is a good person and will help around the house, take care of parents and just be a good wife. But she is a terribly selfish persons. She doesn't do anything and when asked to do has this very reactive behavior wherein it seems like my family is torturing her to do it. Rather its her , we have to clean up after her, which my parents did not sign up for. My parents informed her parents of her behavior and they wouldn't accept. After multiple calls, they were asked to come here and sort this matter. In front of them she did the same thing. They were in disbelief but supported their daughters actions. My rother completely supports her. Its okay for him to see his parents disrespected on a regular basis. Its pains me. Its ruined me mentally. She is a horrible person and I feel my parent's son is too. After multiple fights in the past 7months my parents have asked them to move out continuously since their son wants to live with her. But they refuse to leave and continue to ruin this house's peace. This has caused regular fights and abuses in our house and it has led my parents facing a lot of physical ailments too. She almost hit my mother once. I don't understand how their actions can be justified. It sums up to why my parents are yelling, they are yelling because of your behavior and disrespect. My parents' son is a pilot and the wife is practically jobless. Before marriage my mother forced her to take up a job because why not why wouldn't you be independent. But she fooled us got some job and has been thrown out of it probably the last month. My parents son also doesn't care. But she bring up to argue that since her husband pays for stuff maybe she doesn't need to work or help around the house. this is a pathetic human behavior which my parents don't have to comply. My parents have forgiven her way too much. Please help them to be moved out of this house and live however they wish to. Just leave us alone.