What is the method for calculating Zakat on accumulated wealth for which the specific years it became due, or the principal amount each year, were not recorded, especially given the father's poor memory? And how is Zakat paid on money that uncles deposited with the father and then received back years later? Is it obligatory to pay Zakat retroactively? What is the ruling on money received from car accident insurance, and how is Zakat paid on it? Is it permissible to distribute the wealth before paying its accumulated Zakat and inform the family about it? And would this absolve the father from the sin of not having paid Zakat for previous years?