The Game of (Belgian) Kings

The eBay description for this photo said, 'Prince Philippe playing chess with father, King Baudouin', but I knew better.

25 July 1990 - Chateau de Ciergnon
(Photo: Van Parys Media, Brussels)

From Wikipedia's Baudouin of Belgium:-

The fifth King of the Belgians, following his father's abdication, from 1951 until his death in 1993. [...] Because he had no children with his wife, Fabiola de Mora, the crown passed to his younger brother, Albert II (formerly Prince of Liège), following his death.

From Wikipedia's Albert II of Belgium:-

The sixth King of the Belgians from 1993 until his abdication in 2013. [...] He was succeeded by his son Philippe on 21 July 2013.

If we change that eBay description to, 'Prince Philippe playing chess with uncle, King Baudouin', everything works.