Marble Pie was the sister of Maud Pie, Pinkie Pie and Limestone Pie, the daughter of Cloudy Quartz and Igneous Rock, the aunt of Little Cheese, sister-in-law of Cheese Sandwich, potential distant cousin to the Apple family, ex-marefriend of Big McIntosh and S.O. to her special somepony. Although she was timid and meek for much of her known history, Marble began to break out of her shell in her early college years, showing herself to be a very intelligent and friendly young woman.

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