Answer:
Our knowledge of the development of the teenage brian cannot help us to understand why Greg Ousley kiled his parents in their family home at the age of 14.
This is because, there are other factors such as metal illness, accumulated anger because of how he was treated by his parents as well as outright wilful decision that could have led to him mudering his parents.
There is also possibilty that the unecessary argument by the parents could have taken a toll on him leading to him planning on how to kill both parents which he documented on his journal.
Step-by-step explanation: