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Mary Barley was the daughter of Marvin Barley and his wife. She was the sister of Homer Barley. She had light eyes and light hair.

After Mary's father was killed, she cooperated with police in their attempts to learn more about his criminal associates. She teased and scolded her brother about his antagonistic attitude towards law enforcement.


  • In some strips, Mary was depicted as taller than Homer. This may tend to indicate that she was older than him, but their birth order was not explicitly stated.