You wrote:
The Children of Herman Lulloff and Marie "Mary" Loos are:
Frederick b. 18 Jun 1848 in Schleswig, Manitowoc Co., WI
Philamina F. b. 18 Jan 1880--10 Apr 1880 Schleswig, Co.
Clara 11 Nov 1881 in Schleswig, Manitowoc Co.
William Henry b. 27 Jul 1883, Schleswig, Manitowoc Co.
John August b. 10 Jun 1885, Schleswig, Manitowoc Co.

I have the marriage date as 30 May 1876 ...long after the DOB for Frederick. Are you sure the DOB year for Frederick isn't 1878? or even 1888?

Thanks