When Jens Pedersen was born on 16 May 1836, in Århus, Denmark, his father, Peder Sørensen Lassen, was 33 and his mother, Karen Sørensdatter, was 35. He married Maren Mikkelsdatter on 29 March 1859, in Vitten, Skanderborg, Denmark. They were the parents of at least 4 sons and 2 daughters. He lived in Vitten, Sabro, Århus, Denmark for about 46 years. He died on 15 February 1913, in Vitten, Skanderborg, Denmark, at the age of 76, and was buried in Vitten, Skanderborg, Denmark.