If you've been to a homeschool conference, you've probably met or heard Shirley Solis speak. She and her family own Lifetime Books and Gifts. I've gleaned a lot of wonderful wisdom from her.
She's got these great videos on Building Character and Strong Ethics in Your Children. She gives practical step by step techniques that we can easily apply with our kids. She even covers the subject of sibling rivalry.
She's also got some great YouTube videos. You can just search her by name.

If you use them, let me know what you think.