|Name:||Nicole "Nicky" Reagan-Boyle|
|Parents:|| Erin Reagan (mother) |
Jack Boyle (father)
|Grandparents:|| Frank Reagan (grandfather) |
Mary Reagan (grandmother, deceased)
|Great-Grandparents:||Henry Reagan (great-grandfather)|
|Cousins:|| Jack Reagan (cousin) |
Sean Reagan (cousin)
|Other Relatives:|| Joe Reagan (uncle, deceased) |
Danny Reagan (uncle)
Jamie Reagan (uncle)
|Played by:|| Marlene Lawston (pilot) |
Sami Gayle (ep.2-present)
|First appearance:||Pilot (1x01)|
Nicole "Nicky" Reagan-Boyle is the only child of Erin Reagan and Jack Boyle. Nicky has said that she wants to become the first female Reagan cop. Nicky is well-behaved and intelligent girl who dresses and behaves like a thirty-some odd year old. She is being raised by her mother Erin.
As of season 6, Nicky is attending Columbia University, her mother's alma mater.