Brothers and sisters are sometimes called siblings. About eight out of every ten kids in the United States have at least one brother or sister. That means most children grow up with a sibling! The bond between siblings is often the longest relationship in a person’s whole life. You might know your brother or sister for seventy or eighty years, even longer than you know your parents.
Sometimes two babies are born at the same time. They are called twins! About one in every thirty births in the United States is a set of twins. In 1934, five identical sisters were born in Canada. They were called the Dionne quintuplets, and they were the first quintuplets known to survive. Some scientists study birth order, which means whether you are the oldest, middle, or youngest child. They have found that older siblings often like to lead, while younger ones may be more adventurous.
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