Brother
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A brother is a man or boy who shares one or more parents with another; a male sibling. The female counterpart is a sister. Although the term typically refers to a familial relationship, it is sometimes used endearingly to refer to non-familial relationships. A full brother is a first degree relative.
Brothers from Bangladesh
Grave stele of brothers Eukarpos and Philoxenos of Miletus 2nd c. A.D.
Three brothers
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, it is sometimes used endearingly to refer to non-familial relationships. A full sister is a first-degree relative.
Two child sisters, c. 1911.
Three sisters from the Spencer family, c. 1902.
Isabel, Princess Imperial of Brazil and her sister Princess Leopoldina riding horses, c. 1868.