It turns out Leighton Meester doesn’t just want money back from her mother Constance; she wants her brother Lex.

"Leighton is disgusted by her mother and is determined to get her brother Lex out of that situation," an insider tells Radar Online. "She wants Lex to leave their mom’s California home and come to live with her in New York."

The lawsuit filed by Leighton alleges that her mother used the money she sent “out of the goodness of her heart” for her own gain... and not her son’s brain surgery.

"Although [Constance] is healthy and physically able to work, Constance refuses to do so. Instead, Constance expects her daughter [Leighton] to support her financially," the lawsuit asserts.

Said a source: "Leighton is really close to her brother, so she just hates that she can't be there to help him more.”


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Credit: JustJared Photo: Think Fast! Leighton Meester Laughs, Sings, Answers Random Questions in Cray-Cray Just Jared Interview