Lucius knew that his son was telling the truth just from listening to him. It was good to know that he had learnt that lesson. He had hated punishing him though he had known it was necessary.
"That is true though I am sure she will see that you have learnt your lesson," he said simply. Plus she wouldn't want to get on his badside. While she was Headmistress to him he still had more power in the world than she did and he made sure she knew that.
"It isn't the same no and I appreciate you not running off even if it is your cousin. We are trying to get as much information as we can on her location though. So far we know she is safe which I suppoe is reassuring," he told his son.