Father cheated by partner in business.What action can be taken?

My father and my uncle holds a medicine shop jointly since 2011. They have partnership deeds, trade licence and drug licence with both of their names in those. They hold a cash credit account jointly in a bank for the business operations. They invested equally in the business and the profit was being shared equally (i.e. 50-50) until November 2016. Since Nov 16, my uncle has betrayed my father and he has been taking all the profit. He has misbehaved with my father, told him not to come to the shop, threatned my father of physical assault he doesn't do so. Now, we don't want to do business with him anymore. We want a price against our share. My question is, how can We, by legal means, make him pay us for our share?