Princess Margaretha, Mrs. Ambler Swedish princess; eldest sister of King Carl XVI Gustaf of Sweden (b. 1934) Parents Princess Sibylla of Saxe-Coburg and Gotha Prince Gustaf Adolf, Duke of Västerbotten Children Sibylla Ambler Charles Ambler James Ambler Siblings Princess Christina, Mrs. Magnuson Princess Birgitta of Sweden Princess Désirée, Baroness Silfverschiöld Carl XVI Gustaf of Sweden Partners John Ambler