"He is. Look at him and you'll see," he said. "And of course Draco is my son, my heir, but she wasn't- I didn't-" He stopped because he knew better than to try and justify this. He'd failed her. He should have been more careful.
"He didn't know I was his father until he got the Hogwarts letter, but yes he was very smart about the rest." He couldn't help the small smile on his face. The boy was resourceful, and that would help him.
Lucius moved closer to her, putting a hand on her arm. "I don't know, Cissy. I need you for this. You're smarter than I am when it comes to these things, but I know that we can't leave him with Nott and not because I want you to feel sorry for him, but because if it's kept a secret and an accident were to befall me, Nott would go after Draco and his inheritance, besides the fact that I don't want to die. We need to bring him into the family and make clear that Draco is the heir. How we do it? I have no idea."