He is the youngest child and only son of Prince Gustaf Adolf, Duke of Västerbotten, and Princess Sibylla of Saxe-Coburg and Gotha. His father died on 26 January 1947 in an airplane crash in Denmark. Carl Gustaf was nine months old when his father died. The death of his father, made him second in line to the throne after his grandfather. When his great-grandfather, King Gustaf V, died in 1950, his grandfather became king and Carl Gustaf became crown prince and heir apparent to the throne at the age of four.
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