Darwin IV is a fictional planet in Wayne Barlowe's book Expedition.
So as it is a book, there can be anything.
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William Erasmus Darwin, Anne Elizabeth Darwin, Mary Eleanor Darwin, Henrietta Emma Darwin ("Etty"), George Howard Darwin, Elizabeth Darwin, Francis Darwin, Leonard Darwin, Horace Darwin and Charles Waring Darwin
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Charles Darwin had 10 children.
William Erasmus Darwin (b. 1839)
Anne Elizabeth Darwin (b. 1841)
Mary Eleanor Darwin (b. 1842)
Henrietta Emma Darwin (b. 1843)
George Howard Darwin (b. 1845)
Elizabeth Darwin (b. 1847)
Francis Darwin (b. 1848)
Leonard Darwin (b. 1850)
Horace Darwin (b. 1851)
Charles Waring Darwin (b. 1856)
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Darwin's wife was Emma Darwin (born Emma Wedgewood). She was
Darwin's cousin.
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No river flows through the city of Darwin itself, but the Darwin
River flows through Darwin River, an outer suburb of Darwin.