Siblings are very important to many of us. Almost 80% of children grow up with at least one brother or sister. Even though they may not get along all the time, siblings play very positive roles in each other's lives. Brothers and sisters learn their first lessons about getting along with others from one another. They are friends, playmates, and keepers of secrets. They help one another learn to relate to the outside world. They even protect and watch out for each other.