While his younger brother was brought to Disney World, 14-year-old Jacob Remaley had to stay home and do chores.

His parents, who seemed to favour their younger son Caleb, also bought Jacob a vacuum cleaner as a Christmas gift a few years ago.

This was what was testified in US court hearings against Jacob, now 16, who allegedly shot and killed his mother and younger brother in November 2016, reported US news channel CBS Pittsburgh.

Forensic psychologist Alice Applegate, who was called up by the defense, said in court on Thursday (May 31) that Jacob had four alter egos - a witch, old man, little girl and wrath.

Another psychiatrist, Dr Bruce Wright, also described Jacob's personalities as an old man, a crazy voice, benign woman and wrath.

"I don't know how long wrath has been involved, but it has been getting stronger and stronger within his personality," said one of Jacob's attorneys Wayne McGrew, according to local reports.

The court also heard that wrath was what came out when Jacob allegedly shot his mother and bother in the head at close range, while they were asleep at their home in New Stanton, Pennslyvania.

Jacob then called the police, and claimed that his father was responsible for the killings.

According to previous reports by CBS Pittsburgh, Jacob then told 911 operators: "Why didn't he kill me? I need help."

The bodies of Dana Remaley and her younger son, Caleb, were later found in their beds.

During questionings by the police, Jacob said he was the one who shot his mother and brother, after his father David left for work.

He also allegedly told police that he would have shot his father too, if he had been at home.

Jacob was subsequently arrested and charged with first-degree murder and criminal homicide in 2016.

During the court trial on Thursday, Jacob's attorney said the boy was in an "altered state" during the incident.

"Once he came out of the altered state, he was very remorseful and very depressed because he knew, the trooper testified in the hospital, wrath came out and told everybody what actually happened," McGrew said.

Jacob's father also testified in court, saying that since losing his whole family, he questioned the things he had done every day in his life. He added he had poor judgment with his parenting, according to a CBS report.

Attorney McGrew appealed to the court to consider Jacob's mental health issues, his age, and the circumstances of his family relationships, and to try Jacob as a juvenile.

Currently, Jacob is being charged as an adult.