When Margaretha Feddersen was born on 13 March 1909, in Ober Glinde, Moorrege, Pinneberg, Schleswig-Holstein, Germany, her father, Wilhelm Feddersen, was 23 and her mother, Margaretha Dorothea Johanna Mecklenburg, was 22. She died on 14 June 1966, in Löwenstedt, Nordfriesland, Schleswig-Holstein, Germany, at the age of 57.