Is it permissible to reveal the secrets of a deceitful friend to his father, who might disinherit him, or to some friends? And is this considered hypocrisy or wickedness? And am I sinful for what he forced me to do by lying to his father?

One should not befriend a person who deals with jinn, seeks to separate spouses, and commit fraud; rather, one must keep away from him. If one is coerced into lying unknowingly or under threat, there is no sin. As for revealing the secrets of this person: if they are sins between him and his Lord, then concealment is preferable. However, if they pertain to the rights of created beings or harm society, there is no harm in revealing them to warn people and restore rights, and this is not considered hypocrisy or immorality.