Unborn Shepherd

Family members:

Addison Montgomery Shepherd (if/then) - mother
Derek Shepherd (if/then) - supposed father
Mark Sloan (if/then) - supposed father

Unamed baby Shepherd or Sloan is the unborn son of Derek and Addison in the episod if/then.

Addison reaveals to Derek that the baby can also be Mark's son, because she cheated on Derek with Mark

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