Sister
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A sister is a woman or a girl who shares parents or a parent with another individual; a female sibling. The male counterpart is a brother. Although the term typically refers to a familial relationship
Two child sisters, the elder tending to the younger c. 1911.
The Game of Chess (1555) by Sofonisba Anguissola (It depicts her sisters Lucia (left), Minerva (right) and Europa (middle) Anguissola playing chess. The older woman is their maidservant.)
The Artist's sister Danica Šantel by Henrika Šantel
Three sisters from the Spencer family, c. 1902.
Sibling
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A sibling is a relative that shares at least one parent with the other person. A male sibling is a brother, and a female sibling is a sister. A person with no siblings is an only child.
A sister (female sibling) carrying her brother (male sibling).
Two brothers from Haiti.
The Benzon Daughters by Peder Severin Krøyer
14-year-old Emperor Pedro II of Brazil with his older sisters, Princesses Francisca and Januária. Painting by Adolphe Hastrel de Rivedoux, 1839