They are fraternal twins, and he really is the first born.

The couple has fraternal twins, a boy and a girl, born in September 2012.

"Is it possible for fraternal twins to have different fathers?"

On average, two normal fraternal twins would share about half their genes.

This was true even for fraternal twins, which are not genetically the same.

Fraternal twins run in families, so genetics also plays an important role.

Despite being very similar in appearance, they are not identical, but fraternal twins.

A pair of fraternal twins will compete against each other this season.

"They say we look a lot alike, especially for fraternal twins," I said.

Two 15-year-old girls, fraternal twins, run away together to create their own private paradise in Kentucky.