There is never any mention of Simon's family. The only things known about Simon's life before his arrival on the island are what Jack reveals. Simon was part of the choir and was prone to fainting.
Piggy told Ralph that both of his parents were dead and that he lived with his auntie, so Piggy was an orphan.
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The Lord Of the Flies itself to Simon
The pig's head is called "the Lord of the Flies". But only by Simon.
Simon
Simon's bower represents civilization.
the thing that crawls out of the forest is Simon.