Just one month after Michael Villalon moved in with his new stepfather, things began to deteriorate. Keith Owen Chaney had changed.
He would nag his 28-year-old stepson for not having a job and rouse on him for going to the fridge.
He threw a knife at him one evening for not using a knife to eat his dinner.
He punched him for knocking on his bedroom door late one night.
He whipped him with a towel for not hanging up his wet towel.
He would openly watch porn and once left photos on the table of their small home in Mascot showing children having sex.
On February 28, 2012, after an argument over leaving the bathroom door open, Villalon "exploded", he would later tell police.
He allegedly attacked Mr Chaney, 54, with two kitchen knives and a hammer, stabbing him in the face, throat, shoulders, chest and torso and bashing him on the head.
The opening of his murder trial in the NSW Supreme Court heard that Villalon's mother, Maria Villalon, returned home from her job as a cleaner in Vaucluse to find the doors locked and the lights out.
Her husband was lying in a pool of blood in the kitchen with a knife in his eye.
She found her son standing in the dark covering his face with his hands. He had showered, locked the doors and tried to take an overdose of prescription drugs and cut his wrists.
Villalon has pleaded guilty to manslaughter but not guilty to murder on the basis that he was suffering from a psychotic illness likely to be paranoid schizophrenia.
A jury will decide whether he was impaired enough to warrant the lesser charge.
"I just exploded," he told police days later. "I take full responsibility for what I've done."
He said he had never retaliated against the continual nit-picking and physical abuse from his stepfather because he wanted to show respect but he "felt like the humiliation . . . had to stop".
The court was told Mr Chaney kept a large amount of pornography in the house, including child pornography, and in 2010 had been imprisoned for doing so.
Villalon took covert videos of his stepfather and uploaded them to the internet, claiming he was exposing Mr Chaney and protecting his own safety.
Villalon's teenage sister, Chelsea, told investigators she hated her stepfather because he was a "pervert" who would ask her to watch pornography with him.
"The impact of this was preying upon the mind of Mr Villalon," his barrister Paul Winch, SC, told the jury.
"By the time the argument happened . . . his capacity to control himself, to understand what was happening, was substantially impaired."
Villalon, who was born in the Philippines, kept his head down for most of the proceedings. His trial is expected to last three weeks.