Sibling rivalry in adulthood is often expressed in terms of who has the higher-paying job or through their children's academic achievements, says Yorgason.
Steer Clear: Have a heart-to-heart talk—with yourself. Accept your own benchmark for success, says Kramer, and let go of comparing yourself with others. You and your siblings don't have to be in equal places to have a mutually supportive relationship, she emphasizes. Considering that these are likely to be the longest relationships you have in life, it's worth the effort.