I checked my database of over 17,000 descendants of Jacob Light, patriarch of the Conestoga Valley Lights and didn't find you, your dad or your grandpa. These Conestoga Lights are the ones Herm Fagaly was talking about in his answer to you. These Lights founded New Richmond and some of them have been hanging around Clermont County for about two hundred years.
Since your dad was born in Van Wert, OH it appears to me that you must descend from the Lebanon, PA Lights, or as I call them the "Light's Fort" Lights. You might want to contact John B. Light at his web site at: http://www.pioneerfamily.com/Light/http://www.pioneerfamily.com/Light/ or his email at: firstname.lastname@example.org
He may have the key to what you are looking for.
If you want to chat I am in Cincinnati at 522-7097.