When Violet Wegner became HRH Princess Pierre of Montenegro, who was her sister-in-law?
Violet Wegner:  Violet then became HRH Princess Pierre of Montenegro and thus sister-in-law to Queen Elena of Italy as well as a host of other European princes and kings via her husband's siblings. 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.
Elena of Montenegro