Peter married Anna Marie (Mary) Peterson Ahlgren on Nov 24, 1877. They are the parents of John Augustus, David William, Alma, Emily Wilheminia, Willard Fredrick, Elizabeth Fredricka, and Alice.
In 1883, Peter and his two wives, Annie & Mary, moved to Vernal, Utah due to Peter's bad heart and fheumatism. The twins, Willard & Lizzie, were only a month old.
Peter died on July 24, 1887 at the age of 51 years.