Brooks, a Tulsa native, filed an initial petition on Sept. 21 in Rogers County, but the court records didn't surface until last week.
In the lawsuit, Brooks claims that in late 2003 or early 2004, Yukon's Integris Canadian Valley Regional Hospital approached his father, Ray Brooks, and requested a donation from the musician in exchange for a building named after his mom.
The lawsuit claims that hospital representatives met with Brooks on "numerous occasions" for two years and presented the singer with mock-ups of hospital buildings adorned with his mother's name in neon lights. In December 2005, Brooks donated $500,000 to the hospital, according to court records.
He wants the donation returned and seeks punitive damages.
In a response filed on Oct. 13, Integris acknowledged reaching out to Brooks to discuss "potential opportunities with the Brooks family." The hospital agreed that naming opportunities were discussed with him, but denied any promise to name a building in exchange for the singer's donation.
Brooks' spokeswoman, Nancy Seltzer, wrote in an e-mail that the singer had "nothing to add to the petition."
"This deals with his mother, the hometown and the people he grew up with and is deeply personal," she said. "Joe Wertz