With a bit more research, I've determined the following:
My maternal great-grandparents: Frederick (1838-1909) & Augusta (1858-1922) Tetzlaff
Their nine children: Elisabeth – oldest of the children Herman Gustav Edward – baptized 1898 Louise– married to Gustav Wurch 1898 Bertha Maria Elisabeth – confirmed 1899 Martha Maria – confirmed 1902 Wilhelm Fredrich – confirmed 1904 Charles? Elsa Lydia Lillie (a.k.a. Lillian) – baptized 1900, the youngest of the children and my maternal grandmother (Still missing one name)
My great-grandparents moved to Fairwater Wisconsin before 1898 from Germany with seven to nine children.I originally thought all nine were born in Germany but now think the last two may have been born in the US.I was not able to track down their immigration records from the Ellis Island database on-line, so perhaps they came before 1892 (data of first electronic records) and took a few year to get to Wisconsin.