When Karen Jensdatter was born in 1685, in Ibsker, Bornholm, Denmark, her father, Jens Nielsen, was 39 and her mother, Giertrud Ibsdatter, was 31. She married Anders Nielsen on 25 March 1703, in Ibsker, Bornholm, Denmark. They were the parents of at least 1 son and 2 daughters. She died in 1738, in Gadeby, Bornholm, Denmark, at the age of 53, and was buried in Bodilskirke, Bodilsker, Bornholm, Denmark.