The brother of Tejano icon Selena, who also co-wrote some of her biggest hits, is suing his sister. A.B. Quintanilla accuses Suzette Quintanilla Arriaga and two family businesses of withholding the contractual share of profits tied to the Grammy winner’s legacy. And he wants a jury trial. The suit is the latest in a public feud among the Quintanilla family, which erupted after the death of Selena’s father.