Mom was sick, and my biological dad was a waste of space. In and out of prison. At his best when he wasn't in our lives. The best we could afford was a tenement building in Crime Alley.
After they died, I stayed on the streets until Batman caught me boosting the tires off his car. I thought he'd send me to juvenile detention. He ended up adopting me instead. Which led to the vigilante thing. I've seen the justice system from both sides.