Access to my Property

My father owned agricultural land in Coimbatore. I am the youngest son in the family of 6 (4 sons and 2 daughters). About 20 years ago our property was divided equally and registered. Two of my brothers and one of my sisters sold the their property. About 5 years ago one brother and one sister who still hold their share of the land developed the combined thir property as a township. Most of the sites were sold and built the houses. My share of the property has no more access and they built a wall to separate my land from their developed township. Since I live in USA, I haven't done anything to my land. Recently I asked a contractor to build fence and cleanup the property. Unfortunately my brother and sister's family are against anyone use the street that leads to my property since the street belongs to their original property. How can I access my land? I assume the street should be accessable to anyone and is not a private property. Please advise me what do I need to do to access my land.