The Vanishing Half
From the book jacket:
"Twins, inseparable as children, ultimately choose to live in two very different worlds: one black and one white.
The Vignes sisters will always be identical. But after growing up together in a small, southern black community and running away at sixteen, it's not just the shape of their daily lives that is different as adults, it's everything, including their racial identities. Many years later, one sister lives with her black daughter in the same southern town she once tried to escape. Across the country, the other secretly passes for white, and her white husband knows nothing of her past. Still, although separated by so many miles and just as many lies, the fates of the twins remain intertwined. What happen when their own daughters' story lines intersect?
Weaving together multiple strands and generations, from the Deep South to California, from the 1950s to the 1990s, The Vanishing Half is at once a riveting, emotional family story and a brilliant exploration of race, gender, and identity, and the lasting influence of the past as it shapes a person's desires and expectations."