Dear Thomas Shockley,
Thank you for posting your inquiry on History Hub.
Please visit NARA's Resources for Genealogists for research ideas for your family genealogy. Includes information on National Archives records that may help with your research.
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Have you tried searching the U.S. Census records? I see a Daniel Shockley listed in the 1850, 1860, 1870, 1880, and 1900 Maryland censuses. All these individuals were born between 1820 and 1824 and were then living in either Wicomico or Worcester counties. All these census records are freely available for viewing at www.familysearch.org after you sign-up for a free account.