How can I claim my father’s share of ancestral property?

My grandfather's property has not yet been partitioned, and he has passed away. My father and his siblings had disputes over the partition, but my father has also passed away recently. All my father's siblings want to sell the property or give it to a joint venture, but I want to claim the part of the land that belongs to my father, so I can start constructing a house. My father's siblings are not agreeing to this, and the conversation ended in a verbal fight. Please provide legal assistance on how I can claim my father's share of the ancestral property and how to proceed further. How long will the legal process take?