Why is juror five convinced that the boy did not stab his father?

Juror Five is convinced that the boy did not stab his father because he relates to the boy's background, having grown up in a similar environment. He believes that the evidence presented, particularly the way the murder was committed, does not align with the boy's experience and capability. Additionally, he questions the reliability of the eyewitness testimonies and the overall circumstances surrounding the crime, leading him to doubt the boy's guilt.