These Twins Are Only Half-Siblings...Yep, You Read That Right

When Mia Washington gave birth to twin boys in 2010, something didn't seem right. Although they were born just seven minutes apart, DNA testing revealed that they had different fathers. Twins who are also half-siblings, also known as "superfecundation twins," are rare, but can occur when a woman has sex with two men during the same ovulation cycle. In these cases, two eggs are fertilized by different sperm. Despite having different fathers, the children develop together as fraternal twins. Most of the time, only one egg is released into the fallopian tube during ovulation. Sometimes, however, two to three eggs...

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