Cassandra " Cassie" Sloan Shepherd
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Cassandra and Jackson
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The twisted sisters
Cassandra, Cristina and Meredith
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The Sloan's
Cassandra and Mark
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The Shepherd's
Cassandra and Derek
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Breathing
FanfictionCassandra Marie Sloan Shepherd or Cassie, she the younger half sister of Derek Shepherd and Mark Sloan. She's a third year resident at Seattle Grace, following in her older brothers footsteps to becoming a surgeon.