Who or what are Clark and poindexter in Watson's go to Birmingham?

In "Watson's Go to Birmingham - 1963" by Christopher Paul Curtis, Clark and Poindexter are characters that represent the challenges and dynamics within the Watson family. Clark is a nickname for the family's pet dog, demonstrating the warmth and normalcy of family life. Poindexter is a term used by the family to refer to a nerdy or awkward person, reflecting the playful banter and sibling rivalry among the Watson children. Together, they contribute to the story's themes of family, identity, and the complexities of growing up during a turbulent time in American history.