"Sirius, this is the Black family home, yes? And for hundreds of years we've set the stage for what's acceptable and not acceptable in Society, yes? I'm setting a new stage, one that's not based on snakes, darkness and really horrible sense of decor," he said, as if explaining to a child. "You are a Black. Yes, I do want you here, but not if you will ruin it."
He snorted. "There will be no hexing in here. My guests have much better manners and I will make you regret it if you ruin this for me," he said. "Besides, if Lucius can behave, so you can you."
He motioned with his head toward the stairs. "Do you want to see the first floor?"