"The War with Grandpa" is a children's novel written by Robert Kimmel Smith. It tells the story of a young boy named Peter, who is upset when his grandfather moves in with his family and takes over Peter's bedroom. Peter decides to declare war on his grandfather in an effort to get his room back.

At first, Peter is determined to win the war, but as he gets to know his grandfather better, he realizes that his grandfather is not just a stubborn old man, but a person with a lot of experience, wisdom, and humor. Peter's grandfather has a lot of interesting stories to tell and is full of surprises. He is able to turn every situation into an adventure, and Peter finds himself enjoying his grandfather's company more and more.

As the two engage in a series of pranks and challenges, they grow closer and form a strong bond. Peter's grandfather teaches him important life lessons and shows him how to be a better person. Peter learns to appreciate his grandfather for who he is and comes to understand that there is a lot more to life than just winning a war.

Meanwhile, Peter's family is dealing with their own problems. Peter's mother is struggling with her job, and his father is worried about money. Peter's sister, who is in high school, is dealing with her own set of problems and is not able to spend much time with Peter. Despite all of these challenges, Peter's grandfather is always there to help and support the family.

In the end, Peter and his grandfather come to a resolution and agree to end the war. Peter decides to give up his room to his grandfather, and the two of them continue to have fun and explore the world together.

"The War with Grandpa" is a touching and funny story that is sure to appeal to kids and adults alike. The novel is a celebration of the bond between grandparents and grandchildren and the lessons that can be learned from each other. It is a book that is full of heart and humor and is sure to bring a smile to your face.