Warner Werner Verner from Germany

I have an August Warner b. 6 January 1848 in Germany. Not sure how he got to America but he died on 4 Jan. 1926 in Center Grove, Story, Iowa. He gave the following information regarding his parents and siblings to his son Howard Emil:

1. Father = Nicolas Werner/Verner
2. Wilhelmina Doescher
3. William - brother
4. Minnie = sister
5. Mellie = sister

Supposedly, his father was from Hanover and his mother was from Hamburg.

Any help would be greatly appreciated.

Thank you,

Susan Richards