How can one deal with a father who rejects his son, denies his success, and causes problems for him and his wife, knowing that the son loves his father and fears that he might order him to do something that would harm his life?

You must be patient and kind to your father and siblings, and meet their ill-treatment with kindness. Allah will be with you. You are not obliged to obey your father if he orders you to abandon your wife or divorce her without a legitimate Shar'i reason, for obedience is only in what is good and permissible (ma'ruf).