Question: When Violet Wegner became HRH Princess Pierre of Montenegro, who was her sister-in-law?
Sentence (from "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.
Relevant evidence: Yes