Bloodchild by Octavia Butler

T’Gatoi had even introduced my mother to the man who became my father.

My parents, pleased with each other in spite of their different ages, married as T’Gatoi was going into her family’s business—politics.

She and my mother saw each other less. But sometime before my older sister was born, my mother promised T’Gatoi one of her children. She would have to give one of us to someone, and she preferred T’Gatoi to some stranger.