When Mariane Thomasdatter was born on 15 September 1813, in Ørum, Hjørring, Denmark, her father, Thomas Nielsen, was 55 and her mother, Maren Hansdatter, was 40. She married Søren Jensen on 19 September 1833, in Ørum, Hjørring, Denmark. They were the parents of at least 5 sons and 7 daughters. She lived in Ørum, Dronninglund, Hjørring, Denmark for about 26 years. She died on 6 January 1893, at the age of 79.