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In page Princess Lilian, Duchess of Halland:

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Bertil's older brother, Prince Gustaf Adolf, Duke of Västerbotten, was second in line to the Swedish throne; but he died in 1947. As Gustaf Adolf's son, Carl Gustaf, was less than one year old, it seemed likely that, when Bertil's grandfather, King Gustaf V, and father (Crown Prince Gustaf Adolf, the future King Gustaf VI Adolf) died, he would have to serve as regent (other heirs having given up their places in the line of succession because of marriages not acceptable to the king). For this reason, Bertil chose not to marry Lilian, so the couple simply lived together discreetly for more than thirty years. In 1946, Prince Bertil acquired a house in Sainte-Maxime, France, that became their private retreat.[citation needed]