Should a father who drinks alcohol and instigates fights be treated harshly or with compassion? Should one consider reporting him to the police? And is the hadith "You and your wealth belong to your father" authentic?

The right of the father is great and does not diminish if he stops praying or drinks alcohol. The children must advise him gently and warn him of Allah's punishment, providing him with specific fatwas. It is not obligatory to separate from him unless there is a fear of temptation for oneself. It is imperative to prevent him from committing sins by the easiest possible means, such as informing a relative who has influence over him or even the police.