Father died without will. Land to be sold by sons/daughters.

We are three brothers and two sisters. My father died without a will. There is a piece of land in his name. My elder brother earlier told me that the land is in his name but after countering him with some proofs, now he agrees that the land is in our father's name. He wants to sell it as soon as possible and is now willing to give me my 1/5th of the share. Now, there is one another piece of land which is owned by my father, and my elder brother is claiming that it belongs to him. I have raised a condition that only if both the properties are sold or an agreement is made mentioning my rights, only then will I sign. I am now threatened by my brother that if I don't sign, he will file a case against me. He says the other piece of land we will see later, first let us wind this up. 1) Can he file a case against me that I am not cooperating despite all other brothers/sisters ready? 2) Is my condition for signing justified? 3) Can courts direct me to sign if majority heir say so?