2 children with an environment that is the same but the first child early have the best endurance of two unruly children people lazy students unknowingly. The first child has more chances of success, although two children will live in the same environment.
2 children with the environment, but the first derivatives have patience to study the two children who misbehave. Lazy to accidental The first child will be more successful than the second child, even in the same environment.
The child has the same 2 environment but the first child, diligent, patience, studying the second child abuse. Lazy never study. The first chance of successfully over the second child even in a single environment.