Case for Full Share of a House.

Hello, My name is Adil K. Both my parents are deceased. I have an older brother who lives in Oman since 1980s, my parents used to be completely dependent on me financially. I have never asked for money from my brother because I had no issues taking care of my parents. Me and my family reside in the neighbouring building which is my father-in-law's house and my parents used to live in their house. My father only wanted to keep my name on the will but I insisted that my brother's name should be there too, so he feels welcomed and we can stay together. Recently I renovated the entire house and I was on good terms with my brother and I would share every detail as we had a very good relationship. Recently he paid us a visit during which he stayed with us even though he has two flats in Borivali as he had an operation and my wife insisted on taking care, which was supposed to last 25 days but he extended it for 45 days. I was not present for the last 15 days as I had gone for a trip with my friend. During the last two days of his stay he went around badmouthing me to the neighbours and saying all sorts of rubbish, which was completely unexpected. He even gave them a letter stating that I am a fraud and that I have no rights on the house and I am trying to take up his share too, which I had no intentions of doing so, ever. He gave this letter to the neighbours but did not have it in him apparently to submit it to my wife. He printed those letting from my computer and my printer, in my house, against me. I called him up and I told him that I was hurt and that there is no need for all this we can live happily in the house together as a family. He kept blabbing his nonsense on the phone. Then just today he sent us a notice because he has filed a case against us claiming that I am wanting to take away the entire house and the neighbours are helping me in doing so. The electricity, gas bills etc are all on my name because I am the one who has been paying them. He is stating that how dare I put my name as he is the elder son. He feels insecure because my name is first on the share certificate and his name is second. His wife is a well known con woman and she has done this to her sisters and taken away everything from them. I do not have a single house on my name I have two daughters who I want to leave a house to. We were planning on paying him 50% of the market value of the flat or we were to pay 50%(minus the renovation charges IF he insisted on wanting the house or wanting the money. I have contacted a lawyer too but I just want more advice because I don't have a lot of money or any properties unlike him.