Here&#39;s proof that the blond boy is Prince Welf-Heinrich, not Welf Ernst.  Here&#39;s Welf-Heinrich with his older brother, Prince Christian Oskar, and older sister, Princess Friederike, later queen of Greece.  They are all children of Princess Viktoria Luise of Prussia, Kaiser Wihelm II&#39;s only daughter &amp; her husband, Ernst August III, Duke of Brunswick and Hanover.