A:
You must obey your father in doing good and explain to him the true `Aqidah in a polite manner. Do your best to adhere to the Book of Allah and the Sunnah of His Messenger and apply their teachings. You may seek the help of those who adhere to the Sunnah to achieve this goal and behave with your father kindly in the worldly life. Allah (Exalted be He) says,
But if they (both) strive against you to make you join in worship with Me others that of which you have no knowledge, then obey them not; but behave with them in the world kindly, and follow the path of him who turns to Me in repentance and in obedience.
Supplicate to Allah to guide your father to follow His path. Perhaps Allah will answer your supplication so that he listens to your advice, and guides your relatives to the truth.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.