Wersäll became an orphan at the age 11, and grew up with his aunt. In 1879 he married Charlotta Wersäll. Among their 11 children, 9 were boys, one was a girl, and one died soon after birth. They were

• Karl (1881–1945)
• Ture (1883–1965)
• Adolf (1885–1963)
• Gustaf (1887–1973)
• Claës-Axel (1888–1951)
• Nils (1890–1939)
• Elisabeth (1892–1985)
• Johan (1894–1959)
• Lars (1898–1952)
• Otto (1900–1983).

Six of the boys took part in the 1912 Summer Olympics: two as competitors, one as an official, and three as assistants, while another one, Ture, won an Olympic gold medal earlier in 1906. For this unusual achievement, their mother was awarded a special gold medal at the 1912 Games.

In 1914–1915 Wersäll developed a cerebral hemorrhage, which resulted in his deaths in 1919.

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