The 12 Dancing Princesses was an animated movie with Barbie as Princess
Genevieve and her eleven sisters. Some of the characters are black so I
guess most of these sisters are adopted siblings ;) Some of them came in two
versions, both caucasian and black. The twins Hadley and Isla, are two of
them. The twins has a special body, only ever seen on them - with
nonbendable legs with one of them stiff in a ballet position and molded-on
ballet shoes. Their bodies are smaller than Barbie's.
Hadley and Isla was sold together in a gift set with a special Ying/Yang
stand you could stand next to each other and have them mirror dancing - or
each alone on their own stand.