From Halopedia, the Halo wiki
She was born to Staffan Sentzke and his second wife Laura Sentzke, two years after her brother Edvin Sentzke. She is aware of her older half-sister, Naomi-010 and that her father believes the UNSC took her and replaced her with a flash clone. Due to the loss of Naomi and the flash clone, Staffan found it difficult to be close to Hedda.
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