Penny's mother was an unseen character who gave birth to Penny, Charles Widmore's daughter.

Charles left the Island regularly and carried on a relationship with Penny's mother during his tenure as Leader of the Others. This interaction with an "outsider" broke the rules that bound the group. Sometime in the 1990s, the Others discovered Charles's transgressions and banished him from the Island. Ben Linus replaced him as the Others' leader. ("Dead Is Dead")

In the flash sideways world, Penny's name was "Penny Milton," suggesting that "Milton" may have been her mother's surname. ("Happily Ever After")

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