Hi Dave, I think I know why you had difficulty finding info on this family. They lived in Marion Co, OH and NOT Marion Co, OR unless they moved there after living in Marion Co, OH.
I found the following family in 1870 living in Tully, Marion Co., OH. William, head, b. Germany, 68 yrs old, tailor. Jacobena, wife, b. Germany, 40. Mary, b. Germany, tailor, 19. Kate, b. Germany, tailor, 18. Henry, b. OH, 14. John, b. OH, 12. Emma, b. OH, 8. Sarah, b. OH, 5.
Then in 1880 some of the family were still living in Tully. Jacobena, b. Kaisroot, widow, 60 yrs old. John b. OH, 21, farmer. Emma, b. OH, 19. Sarah, b. OH, 16.
Do you know where and when the others were born? Do you know their parents names and when they were born in Germany? These are VERY important pieces of info to a volunteer. It helps ensure that I'm looking up the correct family. If you can post or send me an e-mail, I'll be glad to continue with the research. Or you might want to post another query on the Ohio, Marion County Message Board. Successful Searching!