the basic idea i had is that their mother was an empath who used her powers to con rich men out of their money, and she raised her three kids as her little assistant con artists. they would have been very close to each other, since their mother didn't have much time for them, and ideally still are even if they've gone different ways in life - he's a good guy now, whether or not the other two followed him or stayed criminals or decided to try to be civilians