How can we take back possession of our shop from our uncle

Your query is silent on  whose name the rent agreement is executed, because based on facts provided by you reflects that rent agreement was executed in your brother' s name since he is receiving rent receipts on his name.

Further, it is a rented property and you cannot claim possession on the same because there are judgements wherein court has observed that tenancy is not a heritable rights.

However, if your father died without a Will and the business in the shop was of your father, then you can definitely file a suit thereby seeking your share in the revenue of the business and seek partition.