Question: Who is Princess Adelaide Of Saxe-Meiningen's maternal grandfather?
Sentence (from "Princess Adelaide of Saxe-Meiningen"): "Adi" of Saxe-Meiningen (Adelaide Erna Caroline Marie Elisabeth; later Princess Adalbert of Prussia; 16 August 1891 – 25 April 1971) was a daughter of Prince Frederick John of Saxe-Meiningen and his wife Countess Adelaide of Lippe-Biesterfeld.
Relevant evidence: Yes