Space brothers. About two brothers promising to become astronauts when they get older. The younger one achieves it and becomes well known astronaut, while the older brother becomes a bum with nothing to show for it. But he eventually tries out for the astronaut program too, showing his innate skills fit to become an astronaut.
I really liked this one. I learned a lot about space and the process to become an astronaut. Very fascinating. Lots of character building and bonding.

any story about brothers ? NOT incestuous, but I'll take any genre (slice of life, tragedy, angst, action whatever), for example:
- SERVAMP
- Gakuen Babysitters
- The Yuzuki Family's Four Sons