My gggrandfather, William (?) Jacob married Louise Magdalene Raab (b Sept 1896 in Cook County, Chicago - d. Dec 1974 in WI) in the early 1900s - they had 3 children - Fred (b. about 1913, d. about 1947), Ralph (my gf 1915-1979) and Dorothy (b. 1921 - ).
Louise's parents were Max Raab and Mary Schmoeller.My aunt Dorothy's memory is very hazy, but she thinks that Louise was one of approximately 8 or 9 children.
My search is relatively new, but I think I may have found a couple of other siblings.