I earn around 1lakh from my father’s business doing almost nothing. So sad for u OP.
Consider asking ur dad to let u manage the business rather than being a labourer. If they want to pass down the business to u then u should be able to run it and handle customers. Let them understand that. If they dont agree tell them u dont wanna work. Dont consider money now and try to get as much as knowledge of the business as possible.