Leonardo was too surprised by the fact that his father would stand up for him to mind about the cold tone. "Um, yes. Yes sir, we understand each other," he said, sitting up a little straighter in his chair. "I was planning on staying at Hogwarts for school holidays, so I won't have to see him until summer anyway." Unless, maybe, possibly, he could stay with his father for holidays. That was more than he'd hoped for.
"I'd like that very much." He hesitated just a moment, and then because everything was going so well added, "Father."