What To Do If Brothers Are Not Allowing To Sell Parent\'s Property.

My father is in huge bank debt and has been given final date to repay. Since Nov\'19 my father has been discussing the same issue with his 3 brothers and 1 sister. And have jointly decided to sell the property. My father is the only one who has brought several positive customers with good propsal till date. Out of the siblings of my father, 1 brother and sister are ready to accept the highest bid, but my eldest uncle & my uncle before my dad are just delaying the whole process by lying and giving false proposals from customers. what do to.