A Jewish child asked a rabbi "Why does God give people annoying little sisters? All they do is cry all night and poop. Why can't we return them to the hospital, where they came from?"
Rabbi: It's to bring out the love and patience in you.
Little girl: Really? Rabbi: God wants to see how much love and patience you have for you sister, so He can see how much love and patience He should have for you.
Sibling rivalry is the jealousy, competition and fighting between brothers and sisters. It is a concern for almost all parents of two or more kids. It's one of the things that scare me about having another child. Problems often start right after the birth of the second child. Sibling rivalry usually continues throughout childhood and can be very frustrating and stressful to parents. There are lots of things parents can do to help their kids get along better and work through conflicts in positive ways.