However, it's shown that his adoptive parents lied (Gone with the Will).
Meanwhile, Bart's brother Jack Bass has come to town to take over custody of Chuck and take over operations of Bass Industries.
Angry, she tells Serena that she is planning to ship her off to reform school.
The majority of Lily's storylines on the show surround her relationship with her children and her husbands, namely Rufus, Bart, and William, as well as her mother and sister.
Not much is revealed about Lily in the novel series, other than she is the mother of Serena and Erik and that she is married to William.
This begins Lily starting to distance herself from Bart and grow closer to Rufus, despite Bart asking her to give him a chance to change.
At the Snowflake Ball, Chuck sees Lily with Rufus and calls Bart, who is on his way back from a trip to Florida.
Lily is introduced in Pilot, when Serena returns to New York from boarding school.
It's revealed that instead of telling anyone that Eric is in treatment she is saying he's staying with her sister, Carol, in Miami, Florida.
She also listens to the last message Bart left her: where he reveals he knows the real reason she spent a few months in a hospital in France.
At the funeral reception, Lily tries to console Chuck but he rejects her and says he blames her for Bart's death.
That same day, Ce Ce reveals Lily's big secret to Rufus: that twenty years prior she got pregnant with his baby and gave him up for adoption (O Brother, Where Bart Thou? At the reading of the will, it's revealed that Lily was left 20% of Bass Industries.