Thom... I believe your Benjamin and George to be fromGeorge the son of Hannes "John", the son of Hartmann.
George had a son Benjamin F. b.6 Dec 1795, Fayette Co, PA d. 09 Mar 1855 Elbridge Twp, Edgar Co, ILHe married 18 Nov 1821 to Sarah "Sally" HUNSINGER b 1802 Muhlenberg Co, KY d. 08 Oct 1884 Arthur, Douglas Co, IL.
The children of this union were: James Wm., John J, Issac, Matthew, Samuel, "Benjamin", Mary Ann, Thomas J, George W, Emily. My research is not clear on the birth years of these children.
This is pure speculation on my part, but several of the HUNSAKERS left KY to go into southern IL to join other brothers and cousins that had moved into that area in about 1802. The date and birthplace you show of 1828 and Union Co, IL fits into this line.
I hope this is a lead that you can use, and hopefully someone who researches the line of George, one of the seven sons of Hannes "John" can verify the DOB of these children.