I have this information:
Lodowick (possible Ludwick) Harrison had a son, D.W. Harrison, b 1838 of Williamson, TN and died in Wise Co, TX in 1880 or 87.
Also- David Wesley Harrison b 1865 Vandalia, IL died in OK. Unsure if they are the same or perhaps relatives.
My Harrison line mystery is that of my great grandmother-- Lena Irene Harrison Holmes. Born in Vandaila IL she lived in Wise Co, TX several years-children born there-- until the family moved to Indian Territory about the time of the land runs. We do not know who her parents were.
Lena Harrison always said that Benjamin Harrison and William Henry Harrison were cousins of hers.
I wondered if the person you were searching for would have these families connected to their own--with the Vandalia, IL location in common.
Please pass along my email address firstname.lastname@example.org
or mailing address of PO Box 106 Hanna, OK 74845
if they are interested in comparing notes.
Thanks so much!