A 15-year-old boy charged with helping to burn a younger boy could remain in juvenile detention until he’s 21, depending on how his rehabilitation progresses, according to the victim’s mother.

The attacker isn’t being identified because his case occurred in a closed Butler County Juvenile Court hearing on Wednesday, where attorneys also didn’t comment because most juvenile cases are confidential in Pennsylvania.

But police have previously said the 15-year-old defendant is the son of a 36-year-old Edward Myers of Saxonburg.

On May 25, the day of the allegations, Myers was supervising Daniel Podskalny, the 7-year-old son of his then-girlfriend Laure Halliwell, and his own two sons, ages 15 and 11, at his mobile home.

The 7-year-old boy told police that at some point in the afternoon, Myers and his two sons began shooting him with airsoft and pellet guns, according to court documents. Myers later allegedly followed the boy to the bathroom and poured nail polish remover on him.

Daniel said that his shirt was then purposely ignited, apparently by Myers’ older son with a lit cigarette, authorities said.

Police believe Myers video recorded the suspected attack on his cell phone.

The victim, police said, suffered in pain for three to six hours until his mother returned, saw the injuries and took him to the hospital.

Daniel suffered third-degree burns on his face and chest, covering about 10 percent of his body, documents said. He also had welts on his forehead.

Initially, Myers was charged with felony aggravated assault. But already prosecutors have agreed to reduce the charges against him to child endangerment simple assault, reckless endangerment, and possession of a controlled substance and paraphernalia.

Myers’ next hearing is his formal arraignment on Oct. 1.

His 15-year-old son on July 31 was adjudicated delinquent, which is the juvenile court equivalent of a conviction, on misdemeanor charges in the same case as his father. The teen appeared again in court Wednesday.

Meantime, Halliwell said her son has been undergoing counseling to deal with the third-degree burns that scarred his face and chest.

“Daniel will never be the same,” Halliwell said after Wednesday’s hearing. “He had his first day of school yesterday and was terrified because of the way his face looks.”