What is the appropriate way to advise a father who does not pray, knowing that he is aware of the the rulings of Islam and may pray out of hypocrisy in front of people?

The ruling on abandoning prayer was previously clarified in fatwa number 33177. As for the best way to advise a father, it is by honoring him, obeying him, and treating him kindly so that he may accept the advice. One should utilize appropriate situations, such as the death of a relative, and seek help from those who influence him, like his friends or the imam of the mosque. One should avoid embarrassing him or hurting his feelings. Finally, one should supplicate for him with sincerity and devotion.