My parents just simply did not tolerate it. If we (my two brothers and I) fought we were all punished. Didn't matter how often or what it was about...we got punished, we got a lecture about loving eachother...how friends will come and go but family is forever...and so on. We were made to talk things out, hug, kiss, hold hands and all that jazz. My dad went as far as to tie my two brothers in their rocking chairs when really young and make them hold hands for an hour one time....we still get a good laugh out of that one....Kinda let us know how important it was to him and my mother that we got along and loved eachother. They guided us through our disputes and taught us to work things out, not get so bent out of shape over things, and how to ignore someone that was antagonizing us (little brother was reaaallll good at that). We were so close as teenagers we were like best friends. I was the oldest then the next two years younger than me, and the little one was five years younger than me. We were like the Three Musketeers. Sometimes in highschool people would ask if one or the other was my boyfriend because we hung out so much, or gave eachother a hug when we had to go somewhere...or even said "I love you" in public. I would laugh hysterically and so nope...that's my bubbie.
Did we ever argue..yes, but we never held a grudge. Do we still disagree on occassion...yes, but we have for years agreed to disagree about certain things. (Except my middle brother still gets all upset if he sees my gas needle below a 1/4 of a tank..he thinks you have to fill it before then or your car will blow up or something) :)
We had friends whose parents believed that you had to leave kids to work things out on their own. They believed you should never interfere in sibling spats or they wouldn't learn to handle things themselves. Those two hate eachother to this day. They would literally start to fist fight when they got to be teenagers. They didn't know how to work things out and it only escalated. They are two grown men in their 40's and they can't be in the same room for more than an hour without getting into a major fight.
I have two other female friends whose parents did the same thing. Those two can go a whole year and never call eachother on the phone. They will stay in hotels when visiting their parents because they don't have a thing to say to eachother.
I live in IL. The middle brother lives in Columbia, SC and the other lives 45 minutes from him in another town. When we get together we sit up all night talking. We do a beach trip every year for a week with all our kids. We love it. My brothers do a camping trip a few times a year. They meet at my mom's once a month for a Saturday all day.
We really love eachother...and I really believe it is because our parents taught us to. They never gave in. I think we get along better than they get along with their own siblings. I think they really did a great job in that area of parenting.