Is the son obligated to inform his father to repeat the prayer if he performed it in transparent clothes, and how can one advise a father who is negligent in performing prayers and watches movies and TV series?

Delaying the obligatory prayer until its time has expired is a grave sin. The daughter must advise her father to be diligent in observing prayers at their prescribed times, especially the Dawn prayer in congregation at the mosque. A man's awrah (private parts that must be covered) is what is between the navel and the knee. If the underwear or garment is transparent and reveals the color of the skin, the prayer is invalid. However, if it outlines the body shape but does not reveal the skin color, the prayer is valid. The ruling on watching television series and films that violate Islamic law must be gently and respectfully explained to the father.