Have you located them on any of the census or looked for naturalization papers for them? Obituaries might have a clue. The newspapers are on microfilm, if you still live in the Sandusky area. Where are they buried? I would check the cemeteries in and around Sandusky since that is where they lived. My father located a wonderful researcher from Cuyahoga County who was familiar with Erie County. Her fees are reasonable and she obtained 54 marriage certificates in 3-1/2 hours of research time. She got them on Monday and he received them in the mail yesterday. If you decide to go that route let me know off list and I will put you in touch with her. Sharon in So. California