Legal issues of land property

Good afternoon sir, Myself Kandarp navinchandra Pickls and I'm from bharuch dist. Gujarat. I came to know about you by unacademy platform sir. My dad is also advocate in bharuch district court and I wanna have a legal advice from you sir. My grandfather had purchased a piece of land around 40-50 years ago from his cousin (uncle's son) without any documentation and my grandfather and his cousin both have died years ago. since that time we are farming till today but the recent scenario is that property doesn't belong to us on paper or documents. Now due to increasing land demand we are about to sell that land but unable to do so because of documents and my grandfather's cousin have his childrens have added name of his whole family and when saying said that's not injustice they says if you pay us 50% of land's price we will sign on documents but that land belongs to us and prices are now in crores. Sir we took every legal help but its not fruitful to us. Even case in also ongoing in the court but seems no result in our favor. As i came to know about you just Googled and seems a ray of hope to us. I'm graduated and preparing for 2020 UPSC sir. Hoping for a legal advice from you sir. Thank you.