"Were you left in a basket on their doorstep in the middle of a rainy night?" Sirius asked, a grin on his lips. He shook his head then, but still looked amused. "No, I do believe you," he tried to assure her. He knew he probably shouldn't tease about what could have been a horrible situation for her, but an orphan being taken in by someone in a mansion just sounded like something out of a story.
Curious about the look she gave him, he cocked his head to the side and half shrugged. It was a little complicated to explain without going into wizarding politics. "My family believes a lot of things that I don't. About ... social issues, not something ridiculous like Santa Claus," he clarified, hopefully needlessly, with a smirk. "I was supposed to just be the perfect son, do as I'm told, believe what they wanted me to. I finally couldn't take it anymore so one summer I ran away to a mate's house.
"After that, I suppose they figured I wasn't worth the trouble and disowned me." He was glad to be away from them and knew he was better off, but sometimes it still stung.