When the Falcone family was entirely wiped out and Bruce couldn't stop it in time.. he partly felt responsible, they were a crime family yes. But still.. people. And only one was left living.

A teenager at that. So of course. He was going to take them in. They seemed... calm and quiet. And grieving. The Falcones were a tight knit family and now. They had no family left. So Bruce took them in.