Source: greenlawn.delaohio.com/greenlawn/greenlawndata/w.txt; and www.findagrave.com.
George immigrated in 1850.
In 1880 George and his wife lived in East Saginaw, Saginaw County, Michigan with their son John and five boarders.
George and his wife Anna Eva lived in Columbus, Franklin County, Ohio in 1900, along with their sons John and George, John’s wife Carrie and daughter Florence.
In 1910 George and Anna Eva lived in Columbus. The census reported that both he and his wife had immigrated in 1881.

Source: Illerich Family Book, p. 277; and Ancestry.com—Whitmer Family Tree; and greenlawn.delaohio.com/greenlawn/greenlawndata/w.txt.
She immigrated in 1867.
As of 1900 Anna Eva had had two children, both of whom were living. The 1910 federal census reported that Anna Eva had had two children, one of whom was living.
The Green Lawn Cemetery web iste lists June 11, 1852 as her birth date.