Dude

DNA tests conducted on 18 people conceived at the clinic between 1943 and 1962, however, found that Wiesner was the father of 12.

According to reports in the British media, one of Wiesner’s biological offspring, David Gollancz, has established contact with 11 other children produced with Wiesner’s sperm. Gollancz told London’s Sunday Times that Wiesner could have provided at least 20 samples per year over the life of the clinic, meaning he could have fathered 300 to 600 children.

“Using standard figures for the number of live births which result, including allowances for twins and miscarriages,” said Gollancz, “I estimate that he is responsible for between 300 and 600 children.”