Oh, his brother. Duma nodded slightly. And he could see that he hit on a particularly sensitive subject but he listened. And he made sure Dean knew he was listening - almost like trying to take that pain into himself and relieve the man of it for even a brief moment. But that question... His eyebrows furrowed together and he looked almost confused. "My brother is Lucifer and you ask if we're less dysfunctional? I've had a vow of silence for ten billion years because of that war."
He sat up straighter to watch as Dean prepared the food, one eyebrow arched curiously, "Is all of it an acceptable answer?" Because he did want to try all of it. It was new and therefore he was curious. Perhaps that was the wrong reaction but he didn't think there was anything sinful about it.