Work Text:
1965: Bobby born (wiki says 1968, but his dating profile says he's 52 in1.08 "A Whole New You". It's not out of the question that he lies on his dating profile, but if anyone has a source for the date in the wiki, please let me know.)
1968: Athena born (she's 9 years old when Tanya dies in 1977, 6.03 "Crash and Learn")
1975/6: Abby born (1.01 "Pilot", she says she's 42 in January 2018. She says this in a way that means she could have just turned 42, which would put her birthday in 1976, but it's more likely in 1975.)
1977: Tanya Kingston killed (6.03 "Crash and Learn")
1980: Chimney born (wiki, no canon confirmation that I could find)
1979: Hen born (she says she joined LAFD when she was 30) probably in April (her birthday is in 8.13 "Invisible" which aired April 3rd)
1983 or 1984: Daniel Buckley born (4.05, "Buck Begins", he was 7 when Buck was born in 1991.)
1984: Maddie born (from the wiki. Canon confirmation pending, but she is at least 36 in 2020.)
1985: Chimney moves to the US (if he was indeed born in 1980.)
1988/89: Hen's father leaves (when she was 9, 2.07 "Haunted"
1989: Athena quits law school to become a cop (3.07 "Athena Begins")
1988: Daniel Buckley diagnosed with leukemia (4.04. "9-1-1 What's Your Grievance", Maddie says he was diagnosed with leukemia shortly after his picture was taken on the 4th of July, 1988)
1990: Emmett killed (3.07 "Athena Begins")
1991: Buck born (he was 26 in January of 2018, 1.01)
1991: Chimney's dad goes back to Korea (assuming 1980 birthdate)
1992: Shannon born (6.15, "Death and Taxes")
1992/3: Daniel dies (when Buck was 1, 4.05 "Buck Begins")
1992/3: Eddie born (Shannon's gravestone says she was born in October, so for he and Shannon to be in the same grade, Eddie would have to have been born sometime between August 1992 and September 1993. Probably closer to the end of 1992 or early 1993, because he was already done with basic training and deployed when Christopher was born in September of 2011.)
1995: Chimney's mother Jee-Yun dies (presuming 1980 birthday; 3.11 "Seize The Day")
1996: Buck learns how to ride a bike (4.05 "Buck Begins")
1996/97: Hen gets hit by a stray bullet like a true lesbian (2.05 "Dosed")
1999-2003: Adriana Diaz born (5.17 "Hero Complex" - Eddie made eggs for his sisters at age 12, so Adriana was at least a toddler in 2004. Ramon gave Eddie the "man of the house" speech when Eddie was 10. It's not specified that both sisters had been born by then, but it would make sense timeline-wise. We also know Eddie was big enough to reach the car pedals but not much higher than the steering wheel when his mom went into labor, so I'm guessing he was somewhere between 7 and 10.)
2000: Albert born (he's 20 years old as of 2020, 3.11 "Seize the Day")
2003: Athena marries Michael, May Grant born (both stated to be fourteen years before January 2018)
2003: Robert Nash Jr born
2004: Maddie moves to Boston with Doug and starts nursing school (4.05 "Buck Begins")
2005: Brook Nash born (she would have been 13 in 2018, 2.06 "Dosed")
2005: Chimney and Kevin join the LAFD (2.12 "Chimney Begins")
2005/06: Kevin dies (they're still in their probationary year, per 2.12)
2007: Harry born (he's 10 in January 2018)
2010: Hen quits pharma and joins the LAFD, breaks up with Eva, meets Karen, U-hauls with Karen, and adopts Denny. (2.19 "Hen Begins," 6.06 "Tomorrow")
Late 2010/early 2011: Eddie enlists in the army (3.15 "Eddie Begins")
2011: Christopher born (3.15 "Eddie Begins")
2012: Buck leaves Pennsylvania and starts traveling (4.05 "Buck Begins")
2013: Eddie re-enlists (3.15 "Eddie Begins")
2014: Marcy, Brook and Robert Jr Die in an apartment fire (2.16 "Bobby Begins Again")
2014: Gerrard is removed from the 118 (Hen says in 2.16 that Bobby joins approximately two years after Gerrard leaves)
2015: Eddie's helicopter crashes, Shannon leaves for LA (3.15 "Eddie Begins")
2015: Buck leaves Peru for LA (4.05 "Buck Begins")
2016: Bobby joins the 118 (He relapses when he joins the 118 in 2.16 "Bobby Begins Again" but had been sober for 500-some days as of January 2018, 1.04 "Worst Day Ever")
Late 2016 or early 2017: Tommy breaks up with Abby
2017: Eddie and Chris move to LA (3.15 "Eddie Begins")
2017: Buck joins the 118 (4.05 "Buck Begins")
2018: Maddie moves to LA (2.01, "Under Pressure"), Eddie joins the 118 (2.01, "Under Pressure)