I recently read an  interesting book titled The Vanishing Half by Brit Bennett. It is a Good Morning America Book Club Pick and a New York Times Best Seller. It is set in Mallard, Louisiana, a small ideological community of light skinned blacks. Dark skinned blacks are not welcome in this small town. The book focuses on the lives of two twin sisters, Desiree and Stella. As the girls grow up they are stiffed in the small town and as soon as they are old enough they run away to New Orleans. Their paths part, one sister moves to DC and married an abusive dark skinned man and the other passes herself off as white and marries a white man. 

From the June 3, 2020 NPR review by Heller McAlpin, The Vanishing Half, Counts the Terrible Costs of Bigotry and Secrecy. 
"In Mallard, nobody married dark," Bennett writes starkly. Over time, its prejudices deepened as its population became lighter and lighter, "like a cup of coffee steadily diluted with cream." The twins, with their "creamy skin, hazel eyes, wavy hair," would have delighted the town's founder.

It is an intriguing story of secrets, identity, racism, and family ties.