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Throughout the series, it is known that Erin is an orphan and lived in foster care throughout her childhood.

At the Q and A session in the finale, Erin's mother comes to the microphone, saying she has a question for Erin. She asks if Erin would hate her mother, to which Erin replies that she would yell at her, saying the following: "Maybe sometimes. But not like 'hate' hate. More just like, 'Mom, I hate you!' And then she would say 'go to your room, young lady.' And I’d stamp my foot and run upstairs and I have a room, which is really cool. And then we’d just have dinner together." Erin's mother clearly feels guilty and keeps on saying Erin's name until she realizes that that is her mother, hugging her. 

Later, at Dwight and Angela's wedding, Erin's mother can be seen socializing with Erin and her father. In a deleted scene, she tells Erin that she and her husband were too young to raise a baby and set her up for adoption.

Quick Answers

Who played the role of Erin's mother in The Office? toggle section
In 'The Office', the character of Erin's mother was played by Joan Cusack. Her appearance was in the ninth season's finale during a Q and A session with Erin.
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When does Erin's mother first appear in The Office? toggle section
Joan Cusack, playing Erin's mother, appears for the first time in The Office's series finale. She reveals her identity as Erin's biological mother during a Q and A session.
Provided by: Fandom
What is the relationship like between Erin and her mother in The Office? toggle section
In The Office, Erin's mother, played by Joan Cusack, appears in the series finale. She meets Erin, who grew up in foster care, during a Q and A session. She questions Erin about potential resentment, prompting Erin to describe a normal mother-daughter disagreement. Erin's mother shows remorse, repeating Erin's name until she is recognized. They hug, signifying a turning point in their relationship. Subsequently, she is seen interacting with Erin and her father at a wedding.
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How does Erin react when she first meets her mother in The Office? toggle section
Erin's first encounter with her mother, played by Joan Cusack, occurs in the finale of The Office during a Q and A session. Erin's mother asks her a question, leading to Erin's realization of her mother's identity. She responds by hugging her mother, showing a positive reaction to their reunion. Subsequently, Erin, her mother, and her father are seen socializing at Dwight and Angela's wedding.
Provided by: Fandom
What is the significance of Joan Cusack's character in The Office? toggle section
In The Office, Joan Cusack portrays Jan Levinson, Vice President of Northeast Sales at Dunder Mifflin. She supervises Michael Scott, the Scranton branch's Regional Manager. Her character is marked by a humorous, dysfunctional relationship with Michael due to their contrasting work attitudes. Introduced in the pilot episode, Jan continually reappears to enforce corporate policy on Michael and plays a significant role in major decisions, including branch downsizing.
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