Of course, there were also tests to confirm whether the child was actually eligible for such a post, and when Drake had given this test at the age of five, he passed it with flying colors.
James never wanted to take up the leadership. He started his own business, but that's the thing for the future.
Tyler was the only son of Marshal's right-hand man who died in an Interstellar war against the aliens years ago. The warrior died while saving the Marshal when Tyler was just born through the conception capsule.
In depression, even Tyler's mother died, leaving him alone in the world. So the Marshal took the little guy in. That's how Tyler started living with Drake and James for as long as they could remember.