|Parents:|| Danny Reagan|
Linda Reagan (deceased)
|Sibling(s):||Jack Reagan (older)|
|Grandparents:|| Frank Reagan (paternal)|
Mary Reagan (paternal, deceased)
|Great-Grandparents:|| Henry Reagan (paternal)
Betty Reagan (paternal, deceased)
|Cousins:||Nicky Reagan-Boyle (via Erin)|
|Other Relatives:|| Erin Reagan (aunt)|
Joe Reagan (uncle, deceased)
Jamie Reagan (uncle)
|Played by:||Andrew Terraciano|
Sean is the youngest of the Reagan grandchildren. He was once involved in a serious bike accident which resulted in bruising to the brain and Sean falling into a coma for over twenty four hours. Like all Reagans, he attends Catholic school and has generally remained out of serious trouble.
Together with his brother, he participates in many sports including soccer, lacrosse, football, and baseball. Recently his request for a basketball hoop at their new house was granted.