Anonymous wrote:
Anonymous wrote:A DNA test is one way.
And it used to be a bit more accepted practice. One woman who this happened to (her father was not her dad, the doctor was) wrote a memoir about it:
https://danishapiro.com/books/inheritance/
Doc wasn't her dad. It was a donor.
She was raised with a father she was not related to. Her bio dad was the fertility doctor (or grad student?). This was done with her parents consent though. It was a mixing of the sperm samples and used to be done regularly.