FIONA Darroch suspects she could have up to 300 siblings after discovering her mother's gynaecologist used his own sperm to help hundreds of women fall pregnant over at least 15 years.
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The Hunter Valley woman was just about to turn 53 when she discovered her biological father was not the man she had called 'Dad', but the man who delivered her as a baby, Dr Norman Walker.
"I knew him growing up really, really well," Ms Darroch, now 57, said.
"He was in my life right from the day he delivered me. I was his goddaughter. I have a younger brother and sister from him as well."
A nurse who worked with Dr Walker confirmed he had helped "at least 100 families" - many with multiple children, and sets of twins.
"I think he has a lot of kids out there. Hundreds."
