In 1932, Charles Edward's daughter Sibylla married Prince Gustaf Adolf, Duke of Västerbotten, the eldest son of the Crown Prince of Sweden and second-in-line to the Swedish throne. The marriage meant that Sibylla would, in the normal course, become Queen of Sweden. The engagement was announced on 16 June 1932 and the wedding was celebrated on 19 October 1932. That same year (1932), Charles Edward took part in the creation of the Harzburg Front, through which the German National People's Party became associated with the Nazi Party. He also publicly called on voters to support Hitler in the presidential election of 1932. Charles Edward formally joined the Nazi Party in March 1933 and that same year became a member of the SA (Brownshirts), rising to the rank of Obergruppenführer by 1936. He also served as a member of the Reichstag representing the Nazi Party from 1936–45 and as president of the German Red Cross from December 1933–45. By the time he took over this position, the German Red Cross had already been under the Nazis' control.