Final answer:
Timothy's act of throwing family pictures away signifies his emotional turmoil and a desire to distance himself from the family and associated memories, indicating feelings of anger, betrayal, or alienation.
Step-by-step explanation:
Timothy throwing all the family pictures in the backyard in 'House Arrest' is a strong indicator of his emotional turmoil and dissociation with his family. This act suggests that Timothy is experiencing feelings of anger, betrayal, or alienation, which leads to his drastic action of discarding memories that should be precious.
The family pictures likely represent past happiness or a facade of family unity that Timothy no longer recognizes or wants to be associated with. Disposing of these photographs signals his desire to distance himself from those memories and perhaps from the family itself, signifying a deep-seated distress or a pivotal moment of change in his relationship with his family.