Draco knew a dismissal when he heard one. He also knew that his father was aware of his mother's presence. "She's here. You are more than welcome to go as you please, obviously." Of course, the two top floors and the basement were blocked off to anyone other than Severus, unless Draco brought them there. Tracey had limited access to the upstairs.
He hoped that one day this wouldn't be necessary, but that day wasn't here yet. "It was a pleasure seeing you, Father."