Dr Penny Mackieson vividly remembers the moment she was told the woman who she thought was her birth mother, wasn't her birth mother after all.
"It was heartbreaking. The DNA test showed we weren't related, despite the adoption papers saying she was my birth mother. Clearly I was misidentified as her baby, and someone else was misidentified as me," Penny told Noni Hazlehurst on SBS' Every Family Has a Secret.
"The woman didn't want to talk about it and didn't really want to talk with me after that. I wasn't in the picture anymore."
It all stemmed from a grave error made in the hospital when Penny was a newborn. She had been a victim of a baby swap.
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For as long as she can remember Penny has known she was adopted.
Her adoptive parents could not have biological children but had always wanted kids, so they decided to adopt.
They knew very little about Penny's backstory, the only thing they told Penny was that her birth mum was young and still at school when she fell pregnant and wanted to continue her education over raising a child.
"Over the years I did think a lot about who my parents might be. I often wondered if one or both of them were of some European ethnic origin, given I look quite Greek or Italian," she tells Mamamia.
It was in her 20s that Penny decided to apply for her adoption records.
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