I have no dates on the family, but do list Lydia Ackman md. to William Smith with ten children: Emmett, Julius, Albert, Paul, Lucien, Luther, Margaret, Thomas T., Ann, and Marion Smith.I would assume your William P. Smith is Paul above, correct me if I am mistaken.
Lydia was the daughter of John Ackman 1835-1881 and Ann T. Thompson, md. 14 Feb 1862.John is the son of Henry Ackman 1809-Jan 1900 (son of William and Elizabeth Wynn Ackman) and Rebecca Ackman 26 Mar 1807-29 May 1855 (dau. of Charles and Sally Walker Ackman).
Charles and William were brothers from Maryland, but their father's name is unknown to me.
Most of the information comes from a family file at the Grant County, Kentucky library.However, there is a major mistake on the Charles Ackman line.Most sources list a Charles Ackman md. to Sally Johnson.This is incorrect.There was a Charles md. to Sally Walker in MD, and he had a son named Charles who md. Margaret Johnson and moved to Lawrence Co, IL.The children of the older Charles are sometimes listed as children of the younger.I've given you what I believe is the correct genealogy.
If you'd like to discuss the early Ackmans in more detail, please e-mail me at firstname.lastname@example.org