Question: Who is Jean, Grand Duke Of Luxembourg's father?
Sentence (from "Charlotte, Grand Duchess of Luxembourg"): She acceded to the throne on 14 January 1919 following the abdication of her sister, Marie-Adélaïde, due to political pressure over Marie-Adélaïde's role during the German occupation of Luxembourg during World War I. A referendum retained the monarchy with Charlotte as grand duchess.
Relevant evidence: No