What is the Islamic legal ruling regarding a father's harsh treatment of his only son, accusing him of embezzlement, refusing to confront him, or send him the necessary money for living expenses, even though the son swears by Allah of his innocence and is developing the business?

We advise you to be patient, obey your father, treat him well, and be dutiful to him. Your dutifulness to him does not prevent your independence in your trade and affairs. If you have documents proving that you did not take any of his money, show them to him, or appoint someone whose word he trusts to speak on your behalf.