After relocating from their native Kentucky to the Silver Lake neighborhood of Los Angeles in 1997, the twins joined blues-rock act Slydell as backup singers and began to collaborate with other musicians, including Lewis.

NPR: The Watson Twins On World Cafe

The girls were joined at the temple, making it less complex than the Egyptian twins who were joined at the top of their heads.

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That same strong connection existed when their cousins, the twins, joined us.

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In past centuries, when separation was frequently not an option, there are many references to twins who grew up still joined.

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Ms Lux wrote plays and operettas for them and, when her twins were born, they eventually joined the act too.

ECONOMIST: Lillian Lux