That's actually a very apt simile.

One is a grown up older sibling, thrown out of the house because the parents wanted the room for a foster child from a shelter that nobody wanted. (The foster child eventually ended up robbing the parents and demolishing the house, a sad fact that the kicked-out child could only watch from a distance.) Despite being an unwanted child and without any affection from his parents, he made it big in the world on his own.

The other is a spoilt younger sibling, looked after by his godparents after the foster child bankrupted the parents. Growing up in the shadow of his older brother, he knows he has to try hard because everyone will compare him to his brother but however hard he tries, he can never outgrow that shadow. He is also torn between trying to be like his older brother and trying to impose his own personality but has not yet worked out what his personality actually is.