Blanche of Valois [SEP] father
Blanche of Valois
Blanche of Valois (baptised "Marguerite"; 1317–1348) was a Queen consort of Germany and Bohemia by her marriage to King and later Holy Roman Emperor Charles IV. She was the youngest daughter of Charles of Valois and his third wife Mahaut of Châtillon. 
Early life.
Blanche grew up at the French court of her cousin Charles IV of France, who was a nephew to her father. She spent much time with Charles' wife Marie, who was an aunt to her future husband.
Catherine of Bohemia
Catherine of Bohemia (, ; 19 August 1342 – 26 April 1395) was Electress of Brandenburg, the second daughter of Holy Roman Emperor Charles IV and Blanche of Valois.
Catherine was born on 19 August 1342, the third child and second surviving daughter of Charles IV, Holy Roman Emperor, and his first wife Blanche of Valois. On 13 July 1356, Catherine married Rudolf IV, Duke of Austria. The marriage was a political one arranged by her father to make peace with Austria.