
People are always commenting to us about how close our children are. Sure, they bicker and glare at each other occasionally like most kids, but overall they are very loyal and loving towards each other. Their love and loyalty is obvious enough for folks to comment on it and ask us about how we get our kids to actually like each other. The short answer is, "We force them!"
Lee and I made a decision to encourage the virtue of sibling loyalty in the kids very early on in our parenting career. We figured not only is it good for the kids, but also, kids who get along well make our lives easier too! Maybe this virtue occurs naturally and easily in some families, but we really put in effort at our home. Many volatile situations arise when you have children very close in age and temperament. Let's face it, most likely after we are dead and gone, they will still have each other. I want them to be able to encourage, support and rely on each other for the rest of their lives.
The main component in our loyalty plan is simply fostering an awareness of the unique and special sibling relationship. We stress to them that brothers and sisters are for life. Friends will come and go, but even best friends will not be as close to you as your siblings. We also consciously foster a sense of family pride and honor. We discuss our goal and purpose as a family and even have a cheesy family song.

In general, we have a low tolerance for bickering and pestering behavior. When we notice someone bugging or speaking rudely to another we intervene as quickly as we can. We give them a *script prompt to help them talk to each other in more kind ways. We get the eye rolls and deep sighs, but they do it and everyone is happier in the end. After they apologise we have them hug or handshake and say 'brothers forever' (with the boys) 'twins are special' (between L and L) and also 'best friends forever' and 'Culloms forever' works well too. It may seem trite to adults, but saying these words while looking at each other in the eyes encourages love and loyalty.
I know this sounds ideal and like we must have stepford kids, but believe me this virtue training is ongoing.

I am the first to explain that they do not always get along perfectly. I have two that are like oil and water and have conflict more than the others. I certainly can't sit back and relax all the time while my kids play serenely in the background, but I can testify to some real results.
I hope these ideas encourage other parents to make a special effort in fostering loyalty among their children.

I am also interested in hearing of ways other families are making sibling loyalty a priority in their homes. So, please comment if you have advice and ideas!
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One of the most helpful tools we have used in fostering this loyalty is how they handle apologies. When someone has done something deliberately and on purpose to hurt or annoy another, a simple "I'm sorry" is not enough. The offender must say some form of, "Please forgive me for X,Y and Z. I really love you and don't want you to be hurt or sad." They must be as specific as possible about what they have done and the offended must say, "Yes, I forgive you." Then they end with the handshake or hug and the special phrase. Of course with friends they don't say all of the sibling stuff, but the basic apology form is the same.
*UPDATE 3/24/2012*
Well I have to say this post is still pretty much ringing true. We've added 2 more kids and kept up the sibling love and loyalty I believe. It's not that we don't have bickering, it's that I still really feel that as a family we still have a strong family bond going on here. I do pray that this continues.