Sarah Polley's mother Diane Elizabeth was an actress and her biological father Harry Gulkin was a theatre and film producer. 

Diane was known for her role as Gloria Beecham in the Canadian television series Street Legal. She has also acted in other television series such as Ewoks, Encounter, Playdate, and Ramona.

Diane was first married to George Deans-Buchan and later married her second spouse Michael Polley. It is known that she and Harry had an affair.

Unfortunately, the matriarch of the family passed away in 1990.

Harry produced the movie Lies My Father Told Me which won a Golden Globe and was also nominated for the Academy Awards. He also served as the Director of Saidye Bronfman Centre for the Arts for four years.

Gulkin married twice, the first time to Ruth Penner and the second time to Marie Murphy. The producer passed away at the age of 90 in 2018.

Sarah grew up with four half-siblings. Susy and John from her mother's first marriage and Mark and Joanna from the second wedding.

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