Cas was absolutely furious; Sirius was just steamrolling all over his authority and not showing him any respect at all. He didn’t want to be fighting with his sister, but Sirius should defer to him when it came to telling Jenny what to do. He got up abruptly and marched into the pantry, fully intent upon giving Sirius a piece of his mind. His brother might claim to be supportive of him taking on guardianship of Jenny and Harry, but his actions were saying differently.