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Annabelle Oleson is the sister of Nels Oleson, she worked in the circus as a sideshow attraction.

Annabelle's only apperance was made in the episode, "Annabelle", and was never mention before or after this episode. In Nels youth he was quite ashamed of Annabelle, due to her weight, and would get to the school house as early as possible so he would not be seen with her, Annabelle knew this. Later in the episode Nels apologized to Annabelle and was no longer afraid to admit that she was his sister.