My grandfather and uncle harassement

I am Sharmila K from Tirunelveli. I am 25 years old. My dad was born with 9 people. He is the eldest. From 12 years old he started business and take care of them. My grandfather doesnt have any business from the start, he was a born with silver spoon person. My grandfather job is to sold the land and jewels from home. My dad was the one who takecare and make all 8 people to study and arrange marriage them in a wealthy family. Two brothers were died . All sister family were good and government employed. Remaining one uncle where unemployed so my dad involves him in business. My dad buy so many land in the name of my dad and uncle. Other part my dads legal heir lands in our local village. 5 years back my dad business comes to end . My uncle make all the business debt in my dads hand and he escaped. Now My grandfather and uncle tie up and threatened not able to sold any land. We sold one land, but my grandfather and uncle take the money and threatened my dad to sign a settlement and get one big business land and leave us empty hand. At that time , my grandfather asked us to read the newspaper content one family were suicide. So you better all suicide like this.But my mom determined to start small business in home and we rent our half of our home. My dads heir land agriculture income was used by my grandfather. He dont allow us to enter our land. He wont allow us to sold the land too. My grandfather came to our house daily morning and told give me all your heir lands to me otherwise I will kill all your family . Then automatically your person less land will comes to my name. Now again they both tie up and asked us leave all our heir land to them. We refuses. Because my dad plans to sold any land to make me get married . Our business property we cant sold because my uncle wont sign the property . He boldly tell all the brokers, how can they married. I wont make it happen . Now my grandfather complain against us in maintaince and welfare of parents and senior citizen act,2007. My grandfather was the one who controls all our land and uses its money. But he complain against us. My uncle and grandfather planned to gather our heir land. During our appeal , my uncle told i am going to give all my land heir to my dad as planned. My dad told he is the one who uses our land and live happily in that money. Atfer 10 days post came, it tells all your heir property was cancelled. Only 30 days more to cancel pending. What can I do?? My grandpa is not poor, having 7 children and 24 grandchild earning more than 50000 per month . How can they without checking anything and cancel our land.