It had been a couple of months since you were discovered by Batman. You were a vigilante, and you worked with him. He taught you how to clean yohr wounds, and even trained you on how to fight better. Bruce gave you the money for food and supplies. He was your mentor. And a pretty good one.
You had lost your parents and were an orphan, he never got your confirmation on it, but he sort of figured it out for himself. He saw your behaviors similar to his own when he was a child. And even similar to the kids he adopted like Jason and Dick.
After a big fight he invited you to the Wayne Manor. It was fathers day, and he knew you had no parent to celebrate or spend it with. Maybe you had good parents or maybe they weren't the best. At his house you met his other kids. They were all unique. But you couldn't help but wish you had something like that too.