The Brag Jar
I don't know about your kids, but my boys have a habit of tattling on each other and reporting the other's faults. Well this summer we started a brag jar where each time one of my boys brags on the other, I add a coin to the jar. When the jar gets full, we will take the money and go do something as a family.
What I have learned through this is that my kids have a much harder time bragging on each other than I realized. We have had numerous sessions where we have sat at the table and taken turns saying something that your brother did nice today and each time I have had to help them remember. They are real quick to tell me what their brother has done wrong, but it is taking a conscious effort to remember what their brother has done good.
The process of looking for the good in someone is indeed a learned skill and what better place to learn it then in the family.
Doing a little therapy with stickers!
Seeing things from a different perspective.