Luc Dardenne — Belgian Director born on March 10, 1954,

Brothers Jean-Pierre Dardenne and Luc Dardenne are a Belgian filmmaking duo. They write, produce and direct their films together... (wikipedia)

Filming is like a house, you have to feel comfortable in it.
Film-makers in Belgium are seen as arts and crafts makers. It is a small country. There is not really a film industry there at all.
Filmmaking has always involved pairs: a director coupled with a producer, a director alongside an editor... The notion of couples is not foreign to cinema.