The Third Brother

The Marquis de Fontanes and his Turkish wife, Princess Mihriban [Miri]have five children. 
Both their daughters and two of their three sons have found their life partnersand are happily settled.
That leaves Joachim, the youngest son.  
 Twelve years younger than his oldest brother, everyone still sees Joachim as a boy. And "everyone" means not just his loving family, but all the people on his father's estate.
So, this year, when both his brothers are away and his father is busy with political affair...