When Pehr Ifvarsson was born on 4 October 1739, in Järvsö, Gävleborg, Sweden, his father, Ivar Persson, was 33 and his mother, Karin Jonsdotter, was 26. He married Carin Larsdotter on 2 October 1763. They were the parents of at least 7 daughters. He died on 16 February 1811, in his hometown, at the age of 71.