Kathleen Shepherd

Kathleen Shepherd is the sister of Derek Shepherd.

Childhood and growing up
Kathleen was born into a large family in New York, the family often meets up on holidays although when Derek stopped, she asked Nancy to visit him (Let The Angels Commit).

Romantic Life
Kathleen is presumably married and has children, which would form part of Derek's nine nieces and five nephews.

Career
Kathleen, like the rest of the Shepherd family, is a doctor, trained in psychiatry.