On the night of the death, Bahadur Singh was visiting his parents and in a "heavy state of intoxication" after drinking whiskey all day.
His brother, Bilkar Singh, arrived about 7pm and an argument erupted resulting in Bahadur Singh following him outside and yelling, "you guys better watch out I'm going to kill you all".
He continued to aggressively challenge his brother to a fight and eventually punched him in the back causing him to all onto paving below.
Police were called and another brother, Jagdeep, was called to the house to help.
Fearing further violence Bilkar Singh, along with a friend and the victim, used rope to tie the offender's hands behind his back with the aim of it holding him until police arrived.
Bahadur Singh continued to threaten his family including threatening to set the Mongrel Mob on them and that he would kill them all and the family property would be his.
He shortly after broke free of his restraint, and the brothers decided to leave the house, leaving just the victim there with his mother.
Bahadur Singh tried to get into the house through the rear door, however the victim tried to keep it closed, and the pair struggled with it.
Singh eventually opened the door and physically confronted his father grabbing his shirt with two hands. His father did the same, then Singh pushed his father whose lower back/buttocks crash through a lower glass pane of the back door.
The glass shattered and Gurnam Singh suffered a large deep wound to his upper right buttock, severing a main artery.
He also suffered a cut to his forearm.
Gurnam Singh was now bleeding heavily and pulled himself from the door frame and dragged himself across the porch before collapsing due to extensive blood loss.
Police arrived shortly afterwards and found him unconscious on the deck and he was eventually taken to Waikato Hospital in a critical condition.
As the victim was being treated, Singh casually entered the house and had a shower.
Justice Graham Lang convicted Singh on the charge and indicated a further charge of assault would be withdrawn at sentencing.
The judge also issued a first strike warning under the three strikes legislation.
Singh was remanded in custody until sentencing next month.