We both have fond memories of our childhoods together and we get along with them well today.
You have the second one as a gift to your first one, so they can go through life together.
After all, I have two older sisters and a younger brother, and my wife has a younger brother as well.
Then I pictured them at 28 and 25, and it was even better – helping them with their houses and careers, traveling together meeting their girlfriends or boyfriends or spouses, and a lifetime of friendship.
If only there were a way to get there without the torture stage.
At that moment, my wife came home from the library with a nice load of books.