It appears that Find A Grave has his birthdate as 1838 rather than the correct 1830
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD4L-YZ8 : 9 November 2014), Peter Whaley in household of Peter Whaley, Worcester county, part of, Worcester, Maryland, United States; citing family 715, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN35-NYX : 17 October 2014), Peter W Whaley, Maryland, United States; citing p. 62, family 21, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,098.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN7S-5XY : 14 July 2016), Peter Whaley, Whaleyville, Worcester, Maryland, United States; citing enumeration district ED 104, sheet 393D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0518; FHL microfilm 1,254,518.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVGQ-Y9YH : 13 December 2015), Peter Whaley, 1906; Burial, Whaleyville, Worcester, Maryland, United States of America, Whaley Family Cemetery; citing record ID 110426114, Find a Grave, http://www.findagrave.com.
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DNA Connections
It may be possible to confirm family relationships with Peter by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Peter: