Question: Who is the paternal grandfather of Bernhard Vii, Prince Of Anhalt-Zerbst?
Answer: Ernest I, Prince of Anhalt-Dessau

From 1544, he assumed rule of the re-created principality of Anhalt-Zerbst. John was the second (but eldest surviving) son of Ernest I, Prince of Anhalt-Dessau, by his wife Margarete, daughter of Henry I, Duke of Münsterberg-Oels, and granddaughter of George of Poděbrady, King of Bohemia. Bernhard VII of Anhalt-Zerbst (17 March 1540 – 1 March 1570), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Zerbst