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Simon gets it. No one thinks he does. He's a little kid. He's not supposed to get it but he does.
Simon loves Monty. He doesn't remember a time when Monty did not exist. It's his job to protect Monty. No one had to tell him. He just knows that it's his job, his responsibility.
His dad loves Uncle Peter the same way. He knows it. He saw it every time his uncle came over.
His dad misses his little brother. Simon knows that. He would miss Monty too.
Simon wishes Uncle Peter would just come home. His big brother misses him.