Siobhan Martin
Played by: Sarah Michelle GellarBio
Siobhan Martin lives in New York is Bridget Martin's identical twin sister. She is married to Andrew Martin, and seems to be living the perfect life, but she has many secrets. She was having an affair with her best friend, Gemma Gallagher's husband, Henry Gallagher, and goes missing on a ship only a little after Bridget's arrival.
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