Faustus' eyes narrowed as he contemplated that. He had a suspicion that there was something Harry wasn't telling him both about the 'pranks' in potions class and what had happened between him and Dad. He also suspected he wasn't going to tell him and neither would Dad. At least not until he was older.
"Dad told me he was a spy for a long time and that's why the Lestranges hate him," he said slowly. "Did it have something to do with that?"