How Much Is My Winning Chances??

My father had made a agreement from his cousins & separated from family.. in agreement it was clearly written that they are making payment by giving cheque of rs 15 lakh.. the date was not mentions on cheque. As they were our family persons my father didn't take this matter seriously after 3 years I had asked for payment but they refuse to paid off.. I had deposited it in my father bank a/c mentions present date.. follow all the procedure & file a case under section 138. Now my question is how much is my winning chances?? And if i win the case what benefits I will get?? now my uncle is saying take half of payment & close the case.. what should I do??