Maintenance case by Father

My father is harassing me by using maintenance act. He has a firm and earning. However, he is hiding all his earning and bank / financial statements from the court. And unfortunately, since I live in bangalore and he has a private firm, I have no ways to prove to court about his earnings. He has simply submitted an affidavit stating he is unable to maintain himself. This saturday my lawyer will cross-examine him. I spoke to my lawyer about getting my father to submit all his financial and property related documents in court. But my lawyer says, he can only question him during cross-examination and that its not possible legally to get my father submit all his statements. What about 11, CPC? I am paying lawyer all his fees, but I am not getting complete details and help from him. Please advise.