Klaaske was born on November 24th, 1789 in Lekkum. Klaaske's father was Jouke Fokkes and her mother was Sjoukje Dirks. Her paternal grandparents were Fokke Heins and Sipkje Eelkes. She had three brothers and four sisters, named Dirk, Fokke, Klaas, Sipkje, Trijntje, Janke and Sepkje. She was the third oldest of the eight children. She died at the age of 6 on November 20th, 1796.