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He is probably Canada’s most prolific sperm donor, but nobody can tell him how many children he has fathered. That keeps him up at night.

The businessman, who is not being identified to protect his privacy and that of his biological children, says he was misled by the Toronto sperm bank he visited regularly over a period of five years more than 20 years ago.

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“I was told a donor would never have more than 10 or 15 children.”

He now knows that is far from true. Because some families of his biological children have contacted him and others have formed support groups, the donor knows he is the biological father of many more than 15 children.

“It is probably approaching 50,” he says. And there could be many more. “I would never have agreed to it if they had told me it was going to be 50 to 100. It keeps me awake at night. I am in therapy.”

Among his offspring are children whose parents were patients of Ottawa’s Dr. Norman Barwin. They were inseminated with the donor‘s sperm without their knowledge.