Kalani and Jarani, the rare black and white biological twin sisters from Quincy, Illinois, celebrated their first birthday on Sunday at a princess-themed party with cake toppers matching their ...

We have all seen twins, some of us even have one ... occur due to unique combinations of genetic material, especially in biracial parents or cases of heteropaternal superfecundation.

Janet and Jean, identical 54-year-olds, became a case study from the paper as researchers found that Jean - who divorced her ...