A sister is a girl in a family. 

A sister is a girl in a family. 

Older sisters often play with younger ones. They may also help their siblings. Younger sisters might not get in as much trouble. 
Sometimes, people use the word for friends too. It is a kind way to talk. Sisters can be very close. They can even be like twins.
A sister is a girl or woman who shares a parent. 

Older sisters and younger siblings have special bonds. Older sisters often play with younger ones. 
Sisters can also change how siblings act. Boys with many sisters may act more feminine when young. They often grow out of this later. Boys with older sisters are less likely to have certain behavioral disorders. Some studies show that men without sisters may find dating harder. In some cultures, older brothers help protect their sisters. This can help them stay safe from bullies. 
A sister is a female sibling. This means she is a girl or woman who shares a parent with another person. 

Sisters often have special ways of acting with their siblings. Older sisters often play with their younger brothers or sisters. 
Having sisters can also change how brothers act as they grow. Boys with many sisters might act more feminine when they are young. Most of these boys grow out of this by the time they reach puberty. Boys with older sisters are often less likely to have certain emotional or behavioral disorders. Some studies even suggest that men without sisters might find romantic relationships harder later in life. These small changes in behavior happen as children learn from their sisters.
Different cultures have different rules for how sisters and brothers act. In some places, older brothers are expected to protect their sisters. This protection helps them stay safe from bullies or other people. 
Many famous works of art show the bond between sisters. 
A sister is defined as a female sibling. This means she is a woman or a girl who shares a parent or a parent with another person. A full sister is considered a first-degree relative. 

The word "sister" has deep linguistic roots. It comes from the Old Norse language. That language derived the word from Proto-Germanic *swestēr. Both of these ancient linguistic sources carry the same meaning as the modern word. Understanding these roots helps us see how long this concept has existed in human language. The term has remained a stable way to describe this specific kinship for many centuries.
Research shows that sororal relationships, or relationships between sisters, influence how siblings behave. Older sisters often play more with their younger siblings. They are also likely to provide a varied gender role to those younger siblings. Younger siblings may display more needy behavior when they are near an older sister. Interestingly, younger siblings are often more tolerant of an older sister's bad behavior. Furthermore, a younger sister is less likely to be scolded by older siblings than a younger brother is.
Growing up with sisters can impact the development of brothers. Boys with only one older sister often display stereotypically male behavior. As they gain more sisters, this masculine behavior can actually increase. Conversely, young boys with several sisters may tend to be more feminine. However, most of these boys outgrow these traits by the time they approach pubescence. Additionally, boys with older sisters are less likely to experience delinquency or certain emotional and behavioral disorders.
Societal and cultural views also shape the sisterly experience. In some cultures, sisters are afforded a role of being under the protection of male siblings. This is especially true for older brothers protecting sisters from bullies or sexual advances. 
There are even specific observations regarding biological and social connections. A study in Perth, Australia, looked at girls who had only younger brothers. It found a "chastity effect" where these girls lost their virginity on average more than a year later than average. Scientists hypothesized this might be due to household errands or pheromones in their brothers' sweat. In a different context, some men without sisters may be less effectual at courtship or romantic relationships. 
Sisters have also been a frequent subject in the history of art. Artists have used the bond between sisters to capture human connection. For example, Sofonisba Anguissola painted her sisters playing chess in 1555. 
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