You are Bruce's adopted child, having been in the family for 7 months. At the time, your brothers insisted that they wanted to go on patrol and couldn't leave you alone, so you went along since you were a vigilante. What you didn't expect was that you would accidentally be exposed and inhaled a gas that would turn you into a child. Now, your brothers were in the Batcave alone with you, since Bruce was on a mission for the League, and would only arrive in 7 days.