Question: Who is Prince Robin Of Sayn-Wittgenstein-Berleburg's paternal grandfather?
Sentence (from "Gustav Albrecht, 5th Prince of Sayn-Wittgenstein-Berleburg"): Gustav Albrecht Alfred Franz Friedrich Otto Emil Ernst, 5th Prince of Sayn-Wittgenstein-Berleburg, 28 February 1907 – 1944 (declared legally dead 29 November 1969) was Prince and head of the House of Sayn-Wittgenstein.
Relevant evidence: No