Hello, Rick. In 1900, Edward is listed as Hartick, with these children at home: Agness, Edith, Lorance, May, Maud(6 born, 5 living). In 1910, he is listed as Hartrick, with these children: Agnes, Lawrence, May, Maud, Frances, Amos, Irene (10 born, 8 living). Do you know in what form the surname came to America? Have you had any success in research in Prussia?