The three sons of Robert A Acreman came to Black Hawk County
in the mid 1850's.
George (1847 - 1934)- Robert A Jr (1857 - 1942) - John William.
There were also two more children that I discovered, but they
did not settle in Iowa.
They were a daughter who married I W Dickerson and lived in SD, and
Daniel who moved on to Australia.
My family line descends from Robert A Acreman - Ackermant -
Ackerman Jr.
Robert
and wife, Martha 
See image below for more family information.
I believe this farm to be around the Dewar area,
as it states in his obituary that he farmed for 33 years after
coming from England to Iowa
Family of Robert Ackerman and Martha Davis
I am unsure of which ones are who, but my great grandfather,
George is in the back row on the left, with Nellie next to him.
Robert and Martha are in the front with one of their daughters
(perhaps Gertrude) as she was younger - between them.
George Joseph Ackerman married Ida Tegtmeier, daughter of
Henry Tegtmeier and Louisa Winning, on 2-27-1906 in Bennington Twp.
Below is a family picture
Family of Ida Tegtmeier and George Ackerman
From left to right:
Clarence, Berdina,(mygrandmother), Esther (peeking over shoulders),
Ida and George, Chester (peeking over shoulders), Gladys and Dexter
They had two children die in early childhood: Harold and June