Thomas (16) Has 196 Half-Brothers and -Sisters From Danish Mass Donor: “I Want to Get to Know as Many as Possible”

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“It’s hard to grasp that I have so many half-siblings,” says Thomas (16), who recently discovered he has at least 196 half-siblings, all conceived by the same Danish donor with a genetic defect. “It would be fantastic to get to know as many of them as possible.” Thomas himself did not inherit the genetic defect.

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The semen of a Danish donor carrying a healthy genetic mutation increasing the risk of cancer was used in the design of nearly 200 children around the world, revealed on Wednesday a survey of the Danish public television DR.