ما هي عورة الأب أمام أبنائه البالغين؟

A man's 'awrah (private parts that must be covered) in front of his adult children or other men is what is between the navel and the knee, according to the majority of scholars. This is unless the gaze is with lust, in which case it becomes forbidden. This is the view held by Ahmad, Malik, Al-Shafi'i, Abu Hanifa, and most jurists.