When Violet Wegner became HRH Princess Pierre of Montenegro, who was her sister-in-law?
Elena of Montenegro Princess Elena of Montenegro or more commonly known as Queen Elena of Italy (8 January 1871 – 28 November 1952) nicknamed "Jela" was the daughter of King Nicholas I of Montenegro and his wife, Milena Vukotić. As wife of Victor Emmanuel III of Italy, she was Queen of Italy from 1900 until 1946 and Queen consort of the Albanians from 1939 until 1943.
Marie Thérèse of France Marie-Thérèse Charlotte of France (19 December 1778 – 19 October 1851), "Madame Royale", was the eldest child of Louis XVI and Marie Antoinette, and the only one to reach adulthood (her siblings all dying before the age of 11). She was married to Louis Antoine, Duke of Angoulême, who was the eldest son of the future Charles X, her father's younger brother; thus the bride and groom were also first cousins.