sibling /sib″ling/ [AS, sibb, kin] , 1. n., one of two or more children who have both parents in common; a brother or sister. The number, age differences, sex, and birth order of siblings can greatly affect the childhood environment and relationships within a family, which also may include step-siblings and half-siblings. Sibling rivalry and jealousy are common in firstborn children, especially when there is a 2- to 4-year difference in age. In general, sibling relationships help teach the child important social patterns and moral values, such as competitiveness, loyalty, and sharing. Also called sib. 2. adj., pertaining to a brother or sister.
