Sister

Lore & Background

The English word sister comes from Old Norse systir which itself derives from Proto-Germanic *swestēr, both of which have the same meaning, i.e. sister. Some studies have found that sisters display more traits indicating jealousy around their siblings than their male counterparts, brothers. In some cultures, sisters are afforded a role of being under the protection by male siblings, especially older brothers, from issues ranging from bullies or sexual advances by womanizers. In some quarters, the term sister has gradually broadened its colloquial meaning to include individuals stipulating kinship. In response, in order to avoid equivocation, some publishers prefer the usage of female sibling over sister. Males with a twin sister sometimes view her as their female alter ego, or what they would have been like if they had two X chromosomes. A study in Perth, Australia found that girls having only younger brothers resulted in a chastity effect: losing their virginity on average more than a year later than average. This has been hypothesized as being attributed to the pheromones in their brothers' sweat and household-related errands.

Reader's Guide

The concept of sister is significant as a fundamental familial relationship, defining a female sibling who shares one or both parents with another individual. As a first-degree relative, the sister occupies a key role in kinship structures across cultures. Studies cited in the source article indicate that sisters may display more jealousy than brothers, and that cultural norms sometimes place sisters under the protection of male siblings. The term has also broadened colloquially to include non-familial relationships, leading some publishers to prefer 'female sibling' for clarity. Research on sororal relationships shows that older sisters often give varied gender roles to younger siblings and develop close bonds, while younger sisters are less likely to be scolded than younger brothers. Boys with older sisters are less likely to be delinquent, and men without sisters may be less effective at courtship. A study in Perth linked having only younger brothers to a later age of first sexual intercourse for girls. These findings highlight the sister's role in shaping sibling dynamics, gender development, and social behavior, making the term both a biological and cultural touchstone.

Did You Know?

• A full sister is a first-degree relative.
• Some studies have found that sisters display more traits indicating jealousy around their siblings than brothers.
• Males with a twin sister sometimes view her as their female alter ego.
• A study in Perth, Australia found that girls with only younger brothers lost their virginity on average more than a year later than average.