A fertility doctor who used his own sperm to father 49 children, without telling their mothers he was the donor, may have even more children.
It was revealed last week that Dr Jan Karbaat, who died in 2017, was the biological father of 49 children, most of whom are now adults.
However, Ties van der Meer of the Dutch Donor Child Foundation said three more people contacted him over the weekend because they suspect they may also have been conceived using Dr Karbatt's sperm.
Mr Van der Meer, whose foundation supports such children, says Dr Karbaat could have fathered many more, including ones who are not in the country.
The doctor died shortly before a legal battle began two years ago to check whether he was indeed the biological father of children born after their parents underwent treatment at his clinic.
Until 2004, people in the Netherlands who donated sperm or eggs could do so anonymously.
"We are all happy with the clarity and the information we now have so we can get on with our lives," said Joey Hoofdman, one of the people fathered by Dr Karbaat.
"It is a wave of emotions. We are all happy we have met each other, but because there are so many, it is complicated."