Oscar of Germany & family - Glass negative photogrpah. Public domain.

Photograph shows Prince Oskar of Prussia (1888-1958) with his wife Countess Ina Marie von Bassewitz (1888-1973) and their children: Prince Oskar (1915-1939), Prince Burchard (1917-1988), Princess Herzeleide (1918-1989); Prince Wilhelm Karl (1922-2007). (Source: Flickr Commons project, 2015)