Blue Bloods · A Viewer's Companion
Four generations of cops, one dinner table. Here's who reports to whom — at work and at home.
Everyone in this show is either a Reagan, married to one, or works for one — and half of them share a first name. This chart untangles it: green borders are Reagan blood, steel-blue borders married in, and the brass strip below is the NYPD family — the people at One Police Plaza who might as well have a seat at Sunday dinner. A little gold shield marks who carries one; Erin gets the scales instead, because somebody in this family has to be the law without a gun.
Why the tree matters: the show is the org chart
Blue Bloods has almost no serialized plot — what it has is this family, four ranks deep, arguing over pot roast. Five facts explain every episode.
Every episode ends in the same room
Sunday dinner is the show’s courtroom, confessional, and precinct all at once. Whatever case Danny bent the rules on, whatever Erin threw out, whatever Frank wouldn’t comment on at the podium — it gets relitigated over grace and mashed potatoes. If you learn only one set of faces, learn the people with seats at that table: that’s the whole chart above.
Joe — and then, ten years later, Joe Hill
Frank’s son Joe Reagan died before the pilot, murdered for getting close to the Blue Templar, a ring of dirty cops. The family avenges him in Season 1 and mourns him forever after. Then Season 10 lands the twist: Joe had a son no Reagan knew existed — Detective Joe Hill, raised under his mother’s name. The dashed red line is that reveal.
Four generations, four kinds of cop
Henry was Police Commissioner. Frank is Police Commissioner. Danny is the detective who makes Frank’s press conferences harder, Jamie the patrol cop who does everything by the book, and Erin the prosecutor who has to clean up after both. The show’s central trick: nearly every family argument is also a chain-of-command problem.
Linda dies between seasons
Danny’s wife Linda, the ER nurse who survived shootings and a car bomb, is suddenly gone when Season 8 opens — killed off-screen in a helicopter crash after actress Amy Carlson left the show. Viewers who missed the gap between seasons spend an episode as confused as you were. Her death shadows Danny for the rest of the series.
Jamie + Eddie: the slowest burn on TV
Officer Eddie Janko is introduced in Season 4 as Jamie’s rookie partner — and yes, Eddie is a woman (it’s short for Edit). Five seasons of riding in the same patrol car later, they get engaged, marry in the Season 9 finale, and have to stop being partners on the job to be partners at home. She’s the only person on this chart who joined the family and the NYPD.
The name decoder
The Reagans honor their own relentlessly — which is lovely of them and murder on viewers. Keep these apart:
Jack Reagan vs. Jack Boyle
Two Jacks, no relation by blood. Jack Reagan = Danny & Linda’s teenage son. Jack Boyle = Erin’s smooth defense-attorney ex-husband, who drifts back into her life every few seasons. One does homework; one does cross-examinations.
Joe Reagan vs. Joe Hill
Joe Reagan = Frank’s son, dead before episode one, the family’s patron saint. Joe Hill = his secret son, a working NYPD detective who learns he’s a Reagan in Season 10 — and pointedly keeps his mother’s surname.
Commissioner Reagan vs. Commissioner Reagan
Both Henry and Frank held the top job. When someone at dinner says “when I was Commissioner,” check which end of the table it came from. Henry’s NYPD was the 1970s–80s version — his advice usually starts with what you could get away with back then.
Eddie is a woman
Eddie Janko is short for Edit (a Hungarian name). If a recap says “Jamie’s partner Eddie,” that’s his future wife, not a buddy-cop sidekick.
Danny vs. Jamie
The two surviving brothers, easy to swap if you’re new. Danny: older, louder, a detective who treats Miranda rights as a suggestion. Jamie: youngest, Harvard Law, joined the force after Joe died, and follows rules so hard it’s a personality.
Nicky Reagan-Boyle
The hyphen is the family history: Reagan from Erin, Boyle from Jack. She’s the granddaughter who questions the family’s cop worldview at dinner — and briefly considers the NYPD herself, to everyone’s alarm.
“Sarge” vs. Sergeant Reagan
Gormley (strip below) is called Sarge long after he leaves the rank behind for One Police Plaza. Jamie actually holds it, from Season 8 on. If someone says “Sergeant Reagan,” it’s Jamie; if they just say “Sarge,” it’s Gormley.
Not kin — but always at One Police Plaza
Frank’s inner circle, plus Erin’s right hand. The show calls them family too; the brass border is theirs.
Garrett Moore
Deputy Commissioner of Public Information — the man who has to sell Frank’s silences to the press, and the closest thing the PC has to a conscience in a suit.
Sid Gormley
Danny’s old squad boss, promoted to Special Assistant to the Commissioner — the voice of the precinct floor inside Frank’s office. Everyone still calls him Sarge.
Abigail Baker
Detective and Frank’s primary aide — runs the Commissioner’s office, knows everything first, and wins most of the arguments she pretends not to be having.
Anthony Abetemarco
Erin’s DA-squad investigator from Season 6 on — ex-NYPD, Brooklyn to the bone, and fiercely protective of her. The one regular who’d rather eat than argue.
A note on the portraits: these are the characters as they appear on screen — stills from the Blue Bloods wiki, cropped and served from this site so nothing loads from anyone else’s servers. Mary Reagan, who died before the series begins, appears the only way the show ever showed her: in a family photograph. Chart reflects the family through the series finale (Season 14, December 2024) — spoilers to there, including deaths and the Joe Hill reveal.