Are you a paying member of ancestry.com? There are a few Dolph / Adolph Dotsons listed on the census and birth/death indexes.... 2 from Texas and one from NC. It would help to supply birth date and place for your grandfather. Also, you might want to try using familysearch.org. It's free and has most of the same records and even some different records than ancestry.com. If you need more help, let me know.

Ronald Dotson