I have a brother 3 years older than me. We didn't get along that much growing up, in our preteen-teenage years as he was kind of a jerk, I was kind of a drama queen. We havent spoken in 6 years.
I have a brother 2 years younger. He did not get along that great with my older brother growing up. See above but substitute pest for drama queen. They also haven't spoken in 6 years.
Older brothers choice not to talk to us, and we don't really know why.
However, I adore my younger brother, always have, always will. We are the best of friends and see each other once a week. He's awesome!