Lucy Petrova, is Katherine's older half sister. But she is not like her, she is much more powerful and on top of that is she Klaus Mikaelsons wife. The two of them haven't seen eachother in 500 years and when their ways cross again, they both change...
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Lucy Petrova is Katherine's older half sister, she looks exactly like her but is not a doppelgänger, she was born on the 13th november 1471, 2 years before Katherine and has a different father, he was a werewolf and her grandmother a witch so Lucy was born with both of these genes. She always had a good bond to her sister but was treated really bad by their mother so she decided to run away when she was 16 and went to England and started her own life. Where she met the Mikaelsons and became friends with them.
