The Indiana parents who claim their “abandoned child” was really a deranged adult with dwarfism are fighting for her mental health records to prove their explosive claims against her.

Kristine Barnett and her ex-husband, Michael Barnett, are both charged with neglect for moving to Canada without Natalia, the girl they adopted in 2010 as an 8-year-old from Ukraine.

But in a story that eerily mirrors the 2009 horror flick “The Orphan,” they claim Natalia was actually in her 20s — and so mentally unbalanced that she repeatedly threatened to kill them, Kristine said in an interview this week.

Now Michael Barnett is fighting for the legal release of Natalia’s mental health records to back up their claims that their fake daughter is severely mentally ill, court records show.

His attorney, Terrance Kinnard, filed a petition Sept. 18 for the records to be released, with a closed hearing scheduled for Oct. 15 to discuss the sensitive personal information.

As well as showing her mental health issues, Natalia supposedly admitted to a therapist that she was really an adult, Kristine claims in interviews.

The legal bid comes as Barnett and his ex are due in magistrate’s court in Tippecanoe on Friday for a hearing into their headline-grabbing case.

Court records indicate that Natalia was evicted from an apartment in Lafayette in May 2014, eight months after the Barnetts had moved to Canada, telling detectives she had been abandoned, according to the Lafayette Journal & Courier.

Police have not explained why they suddenly interviewed Michael Barnett last month — five years after the abandonment allegations were first made.

Natalia’s current whereabouts have not been released, the paper noted.