My brother is six years younger than me, and when we were kids we fought each others like brothers do, but rarely about something really serious. And I was of course the quite older one, so I always could hold him short, hehe. When he turned into a teen, I was glad to find out that it was possible to have more normal conversations with him. (

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Since then we've always been good friends, ie when I moved from my hometown for studies during the early 90s we used to have these really long phone calls every week, and I always thought it was great when he came to visit me.
Now we live in the same city again, and although we always been quite different as persons in many ways (but I guess we have many important values in common), we have a great contact. We try to help each other out if there's some kinda problems, and I actually can't remember the last time we had a serious argument about something.
Tomorrow night we and my brothers' girlfriend are going to a party toghether, and I know we'll enjoy it together.
I consider myself quite lucky as I constantly hear some friends argue or have little contacts with their siblings.