Wisdom (493): The worst brother is the one to suffer for. Sayyid Razi says that this is because it causes more pain, sorrow and hardship than what is possible, and the brother for whom hardship is done, will inevitably suffer from it. So he became the bad brother.

The worst brother is the one to suffer for. Sayyid Razi says that this is because it causes more pain, sorrow and hardship than what is possible, and the brother for whom hardship is done, will inevitably suffer from it. So he became the bad brother.