Cheated my father's money by my uncle in the name of business

My uncle asked my father to lend money for a business venture ensuring profit and interest payments. 20 lakhs were transferred to my uncle's account initially in the name of a non existent business. Rest of the money was collected in the terms of cash from my father.He said the name of a man my father knew as the owner of business. Initially he paid the monthly returns and later in the name of covid refused to pay us the money saying that the business was not going well. After a while through constant research we came to know that there wasn't such business and in fact he was using my father's investment for his own gains like buying lands and transferring the money for his wife's higher education. When my father confronted him, he says he will take the loan and return the money in due time. With interest, he has to pay back 59 lakhs to my father. Last week he promised that he would transfer 38 lakhs to my father's account. Now we have to come know that he fled to UK with his wife using my father's money..My uncle hasn't completed his 10th education and therefore he is to return within 90 days of visiting visa. How can I register the case for cheating and money fraud against him by the time he returns? My father's health has become worse thinking about how his own brother cheated him with his money. Any suggestions and advices are appreciated as soon as possible.