Question: Who is the maternal grandfather of Duke William Of Mecklenburg-Schwerin?
Sentence (from "Princess Alexandrine of Prussia (1803–1892)"): Princess Alexandrine of Prussia (23 February 1803 – 21 April 1892) was Grand Duchess of Mecklenburg-Schwerin by marriage to Paul Frederick, Grand Duke of Mecklenburg-Schwerin.
Relevant evidence: No