The Lucius Malfoy Scorpius actually knows would know to point out that a Weasley-Potter is never going to be a bastion of subtlety. This one only knows that he's hit a nerve with the suggestion that there might be family wandering around out there. He doesn't, of course, know for sure. He can check the registry, but they're all well aware that there are plenty of people avoiding that.

"I believe Sunny," Sunny being the kitchen house elf who works enough magic with pastries to attract a variety of Ministry officials to brunch, "has made rack of lamb with gorgonzola sauce tonight and roasted vegetables." And a chocolate trifle, because she knows well who she's dealing with. "No doubt more than enough for all of us."