The Other Half of My Heart by Sundee T. Frazier

From the Publisher: "The close relationship of a pair of biracial twins is tested when their grandmother enters them in a pageant for African American girls.  When Minerva and Keira King were born, they made headlines: Keira is black like Mama, but Minni is white like Daddy. Together the family might look like part of a chessboard row, but they are first and foremost the close-knit Kings. Then Grandmother Johnson calls, to invite the twins down South to compete for the title of Miss Black Pearl Preteen of America.  Minni dreads the spotlight, but Keira assures her that together they'll get through their stay with Grandmother Johnson. But when grandmother's bias against Keira reveals itself, Keira pulls away from her twin. Minni has always believed that no matter how different she and Keira are, they share a deep bond of the heart. Now she'll find out the truth."
Publisher: Random House, 2010, 304 pp.

One Crazy Summer by Rita Williams-Garcia

From the Publisher: "Eleven-year-old Delphine has it together. Even though her mother, Cecile, abandoned her and her younger sisters, Vonetta and Fern, seven years ago. Even though her father and Big Ma will send them from Brooklyn to Oakland, California, to stay with Cecile for the summer. And even though Delphine will have to take care of her sisters, as usual, and learn the truth about the missing pieces of the past. When the girls arrive in Oakland in the summer of 1968, Cecile wants nothing to do with them. She makes them eat Chinese takeout dinners, forbids them to enter her kitchen, and never explains the strange visitors with Afros and black berets who knock on her door. Rather than spend time with them, Cecile sends Delphine
, Vonetta, and Fern to a summer camp sponsored by a revolutionary group, the Black Panthers, where the girls get a radical new education."  
Publisher: HarperCollins, 2010, 218 pp.