Is the church of Saint Jacques-sur-Coudenberg used much by the Belgian Royal Family given its close proximity to the Royal Palace?
It was used for christenings. As far as i remember the present King Philippe ws christended there and i believe also his siblings and the children of King Léopold III. and Queen Astrid.
And the fuenrals of King Léopold III. and Prince Charles where held there in 1983 but this was because the Cathedral was undergoing renovations then.