2nd marriage dispute

Hi I am Ajay 49 yrs and my uncle who is now 56 yrs old, my uncle was married to my mom after my father's death and he got a son from my mother who has died in an accident 2 years before in 2018. And my mother expired too in 2000. The problem started when my uncle got married again 18 months before after my brother's death, he married to a women who was divorcee and has a girl child12yrs, she is very greedy and she married to my uncle for property and money because she knows he has not any child in blood relation, she started mentally torture to my uncle right after few months of marriage, she is very abusive and steals money everyday from uncle, they moved to another house adajcsent। To our home, which property is on my uncles name, because he want to evacuate us from this issue, but now he is in anxiety and under threat, she warned him that if he takes any acction then she will make false complaints. She is trying to totally control. She don't want to leave because she want to take the home property, as she did in her previous case, in her previous marriage she immidietly files divorce herself after her babygirls birth, nd left her husband house after stealing all money, she couldn't prove the claims in her last case but successful to get huge money through court Please suggest and help us