“I’m still in amazement that this can actually happen. It’s super weird, super odd, super rare, but it makes sense.”
Michelle and Lavinia Osbourne are 49 and just learned they’re half-sisters, conceived in the same cycle by two different men and carried in the same womb. The phenomenon has a name, heteropaternal superfecundation, and fewer than 20 cases have ever been documented worldwide. Worth remembering the next time someone tells you a DNA test is going to be a fun little family activity.