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They are twin, isabella at the left and sofia next to her. In the top 4 judgement, isabella was going through next round overcome sofia. Despite of her-12-year-old, this is what sofia said to Gary, the panelist, about "her favourite moment during Junior Master Chef".

Gary : "Sofia, what is your favourite moment?"
Sofia : "Standing here and knowing that my beatufiul sister is in the top 2."

~Junior Master Chef Australia - S01E16