Hi,
I have two little brothers, one of them is two years younger than me. We have a hate/love relationship. We fight but we can talk too. My other little brother is nine years younger than me, so it is a very different relationship. I'm more a second mother for him or well a big sister.
To answer you question if it is better to get along with you brothers and sister, the answer is yes. It is better, you can go to each other when you have a problem. And when you parents fight, you always have your brother.
It is a import relationship and of course you fight ones in a while but you can count on each other. And it is a shame when it is lost.