The man who told Kentucky police he is the Illinois boy who went missing eight years ago has a history of “doing stupid stuff,” his brother said this week.

Brian Michael Rini came forward on Wednesday saying he was Timmothy Pitzen — who vanished in 2011 at age 6 — and that he’d just escaped two men who held him captive for seven years in southwestern Ohio. When cops asked his age, he told them he was 14 and gave them Pitzen’s date of birth, police said.

After a DNA test, Newport authorities determined he was not the missing teen — but instead a 23-year-old ex-convict.

It’s unclear why Rini attempted to pass himself off as Pitzen.

Rini, of Medina, Ohio, has a long history of mental illness, his brother Jonathon Rini told Cleveland 19.

“He has Asperger’s, bipolar disorder, ADHD, the list goes on,” Jonathon told the station. “I hope he gets help, I also hope he goes to prison for this or at least an institution.”

“I haven’t spoken to him in years,” the brother added. “He’s been doing stupid stuff as long as I can remember.”

Brian Michael Rini has previously been in trouble with police in Medina, and has a record dating back to 2013, according to the station.

Just last month, he was released from the Belmont Correctional Institution, where he was serving time for burglary and vandalism, the outlet reported.

He was back behind bars Thursday night, when he was booked into the Hamilton County Jail in Ohio around 11 p.m.

He is on a holder for the FBI and was expected to be picked up Friday morning, the Cincinnati Enquirer reported. It’s unclear why the FBI is taking custody of Rini, or what if any charges will be filed.

Timmothy Pitzen has been missing since 2011, when his mother, Amy Fry-Pitzen, picked him up from school in Aurora, Ill., and took him to a zoo and a Wisconsin water park.

She was found dead days later with her wrists slit in an apparent suicide in an Illinois hotel room.