Eighty percent of U.S. children have a sibling. Siblings can be sources of companionship, play, and joy—as well as jealousy, rivalry, and aggression. A national survey found that one-third of U.S.
Talking about siblings, some mention their rivalry as almost a detriment to the family. But a YouGov poll found that fewer than half of Americans with at least one sibling (46%) say they experienced ...