The novel follows the lives of two Irish families, the Kellys and the O'Kellys, who are both struggling financially. The Kellys are a Protestant family and the O'Kellys are Catholic, and the novel explores the tensions and conflicts that arise between them.The novel deals with themes such as family, class, religion, and the struggle for financial security. It also provides a vivid and detailed portrayal of Irish society in the mid-19th century, and the social and political issues that affected the lives of its people.Trollope's writing style is characterized by its wit, humor, and sharp observation of human behavior. He is known for his ability to create complex and multifaceted characters, and to explore the moral and social issues of his time with empathy and insight."The Kellys and the O'Kellys" is an important work in Trollope's early career and provides a fascinating insight into Irish society and culture in the mid-19th century. While not as well-known as some of his later works, it is a novel that continues to be read and enjoyed by readers today for its richly drawn characters and its insight into the complexities of human relationships.