General timeline:
1800s:
- Liam was engaged to Rebecca.
- 1854: Rebecca and Allistair were together.
- Alistair was framed for murder and burned at the stake.
- Rebecca was murdered a year later, by the same beast who framed Alistair.
- Liam was the prime suspect in Rebecca's murder.

2001:
- Vincent loses his brothers in the twin tower attacks and decides to enlist in the army.

2002:
- Vincent was declared dead by the US as "officially killed in action".

2003:
- Catherine worked as a bartender while she attended law school.
- Catherine's mom was murdered by Muirfield, Cat was saved by Vincent.
- After Vanessa's death, Cat decided to join the law enforcement.

2012:
- Catherine finds Vincent and discovers he was the one that saved her.

2013:
- Thomas Chandler dies, right before he could tell Cat what he found out.
- Vincent gets captured by Muirfield/Reynolds and disappears for 2 months.
- Heather tells Catherine that Thomas Chandler is not Cat's biological father.
- Catherine finds out that Bob Reynolds is her biological father.
- Vincent kills Li Zhao who created Muirfield.
- Catherine figures out Reynolds is connected to Muirfield, arrests Reynolds and ends Muirfield.

2014:
- Heather finds out the truth about Vincent.
- Cat kills Gabe.
- Vincent declared alive legally.

2014/2015(?):
- Vincent starts working as an ER doctor again.
- Vincent proposes to Catherine.
- Tess becomes Captain.
- Catherine watches the video Vanessa recorded for her, on the night that she was killed.
- Vincent kills Liam.
- Cat and Vincent get married.

Catherine Chandler
Profession: NYPD homicide police detective
Mother: Vanessa Chandler
Father: Robert Reynolds (biological father), Thomas Chandler (step-father)
Siblings: Heather Chandler
Husband: Vincent Keller
Romantic exes: Evan Marks, Gabe Lowen

Vincent Keller
Profession: ER doctor
Formerly: soldier, New York fire fighter
Father: Michael Keller
Siblings: William Keller, Daniel Keller
Nephew: Aaron Keller (NY fire fighter)
Wife: Catherine Chandler
Romantic exes: Alex Salter, Tori Winsor

J.T. Forbes
Profession: Biochemistry professor
Girlfriend: Tess Vargas
Romantic exes: Sarah

Tess Vargas
Profession: NYPD homicide police detective
Boyfriend: J.T. Forbes
Romantic exes: Joe Bishop

Heather Chandler
Profession:
Mother: Vanessa Chandler
Father: Thomas Chandler
Siblings: Catherine Chandler
Romantic exes: Darius Bishop, Matthew

Gabe Lowen
Profession: Assistant District Attorney
Romantic exes: Tyler, Catherine Chandler

Evan Marks
Profession: Medical Examiner
Romantic exes: Claire Sinclaire, Catherine Chandler

Joe Bishop
Profession: former Chief of Police
Siblings: Darius Bishop
Spouse: Miranda Bishop
Romantic exes: Tess Vargas