|Portrayed by||Jay Paulson|
|Final appearance||Indian Summer|
|DOB||Late 1936 or Early 1937|
|Employer||Empire State Building|
|Parent(s)|| Abigail Whitman (mother) |
Archibald Whitman (father)
|Sibling(s)||Dick Whitman (half-brother)|
Adam Whitman was Dick Whitman's half brother.
Adam found Don after seeing his picture in the newspaper and tried to re-establish a relationship with him. Initially unwilling to associate with him, Don agreed to meet him at lunch and later visited him at the place where he was staying. Adam related that all the family had died of various causes: Abigail, his mother, died of stomach cancer (to which a bitter Dick Whitman said "Good"); Uncle Mack Johnson, their father figure, was also dead. Desperate to maintain his break with his past, and fearing that Adam would bring him down, Don gave Adam $5,000 and asked him never to contact him again.
Eventually, Adam mailed a package to Don that contained old family photos. Don's rejection and attempt to bribe him to go away, following so hard on the deaths of the rest of his family, sent Adam into a depression. Not long after sending Don the old family photos, Adam hanged himself.  After a change of heart, Don tried to reach Adam and discovered that he had committed suicide. Don was devastated to lose the only member of his family that he cared about and for whom he had affection. He then began his re-evaluation of the meaning and possible value of his past.