Husband is doing business how to show his monthly income

i filled maintenance case against my husband. he sell new bicycles at ranted shop. my father in law and my husband doing work at same place.they earning 3000-4000 per day and divide 50% income each other per day. my husband was pay education fee of children's 6000 per month. he has car on finance and he is paying 9500 per emi. he pay 9600 per year health insurance of entire family.he maintenance air condition and travel in flights. but he is not income tax payee. now i dont have his income proofs . now he is telling in court that is earn only 9000 per month and his father and mother depending on him. but its not true. now how can i show his income in court to get maintenance for me and my 2 children. i am living at my parents home with my children from 10 months. they are financially week. they cant afford my and my children's expenses. he is not give me any money till now. he decree x partee in court and after this is was came on case date and sing . now he appointed a advocate.