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In 2014, Jacoba Ballard found out her parent’s fertility doctor was her biological father.

Dr Don Cline had secretly inseminated his patients. He swapped either a donor’s or husband’s sperm with his own.

In the past five years, more than 90 siblings have been identified through DNA samples.

Many of those still live within 25 miles of each other in Indianapolis.

Newsnight’s Kirsty Wark speaks to Jacoba Ballard, whose journey to expose Dr Cline has been detailed in the Netflix documentary about the scandal, Our Father.