When Lars Peter Jensen was born on 1 December 1839, in Ulsted, Kær, Ålborg, Denmark, his father, Jens Christensen, was 24 and his mother, Kirstine Malene Larsen, was 34. He married Inger Elsine Nielsen on 9 February 1869, in Ålborg, Vor Frue, Ålborg, Denmark. They were the parents of at least 4 sons and 1 daughter. He died in May 1887, in Ulsted, Kær, Ålborg, Denmark, at the age of 47, and was buried in Ulsted, Kær, Ålborg, Denmark.