What is the ruling on inherited money from which zakat has not been paid for 20 years, knowing that the deceased father used to sell counterfeit goods at the original price? And how is zakat to be paid for those years? Is zakat obligatory on the share of underage sisters? And is it permissible to give zakat to indebted relatives or to those who are accustomed to taking charity and do not seek to work?

Your father's zakat on wealth for all the years he did not pay it must be disbursed, because it is a right belonging to Allah Almighty and to the poor, and it does not lapse with the passage of time. Only the lawful profit from money invested in stocks and investment funds should be disbursed. As for usurious increases and profits resulting from unlawful stocks, they are not permissible for the heirs, and they must dispose of them by spending them on public welfare. The mother does not have the right of guardianship over the assets of adult, mature heirs, nor can she interdict them. Zakat is obligatory on an orphan's wealth if it reaches the nisab and a year has passed over it. If it is proven that your father defrauded people in sales, the money acquired from fraud is unlawful and not permissible for the heirs. It must be returned to its rightful owners if they are known, or given in charity on their behalf if they are unknown. It is permissible to give zakat to poor paternal female cousins, and to the indebted paternal uncle and maternal uncles, provided they are eligible for zakat. It is not permissible to give it to someone capable of earning due to their laziness.