Madison Musick and Kelly Laine have been together for four years and recently got engaged, marking a new chapter in their life as partners and parents. The couple from Gonzales, Texas, is raising ...

You can have three babies that are identical (if one egg splits into three embryos), three babies that are fraternal (if three separate eggs are fertilized), or two babies that are identical and one ...

These mice were genetically identical, so any differences in methylation had to come from epigenetic factors. Global DNA study identifies 175,000+ variants affecting human diversity and disease risk ...

Howard Burack always knew he was adopted, but he never knew he had a twin. Editor’s note: After our original “20/20” report aired on March 9, 2018, the Jewish Board sent written apologies to the twins ...

From Romulus and Remus—the myth of the twin brothers who founded the city of Rome—to the synchronized speech of Australia's "Twinnies" Paula and Brigette Powers, identical siblings have long inspired ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

In 2004, Michigan police found that DNA recovered from a crime scene matched that of Jerome Cooper, a notorious criminal. But what seemed like an open-and-shut case got complicated when the cops found ...