Tianshui Qin's verdict?

From 20 13 to 20 15, Qin Wei's brother worked for two years and never got paid. 20 15, Qin's wife gave birth to a child, and there was no money at home. Then Qin went to his brother's house and asked for money twice, but he didn't get it. Later, Qin got drunk and went to his brother's house. At that time, only his sister-in-law and nephew were at home. Then Qin and his sister-in-law quarreled again when talking about salary. At this time, Qin killed his sister-in-law and his nephew with a kitchen knife. At this time, his niece came home from school and was cut twice by Qin (the niece didn't die). Afterwards, Qin went to Jiangsu and was captured by Jiangsu Interpol at the highway junction. He was sent to Maiji District Detention Center in Tianshui City, Gansu Province, until the Beijing Higher People's Court convicted Qin of intentional homicide.