Legal procedure to file a suit for revoking a sale deed

My father (Hindu) died without any will. We,five brothers &mother are legal heirs to my father's property. Due to jobs etc., all of us are not staying at one place. None of us are staying, where the property is situated. And, we hardly meet all together. My elder brother without my knowledge and consent got executed sale deed in his favour directly without any formal partition deed. My mother & three brothers sold their shares, signed the sale deed on 19-05-2006. In the sale deed, mentioned that I have 1/6th share. But no boundaries were shown about my share. In other words, he is the sole owner for the entire property except my 1/6th share. Recently, I came to know about the aforesaid transaction. My mother also died two years ago. One of my brothers say now that by coercion, he signed the sale deed and opposing the sale deed. Other two brothers are neutral. As there is no partition deed &one of the brothers formally opposing sale deed, Can I file suit for revoking sale deed?