Granddaddy Parallelogram and his grandchildren, Rect the Rectangle and Rhombella the Rhombus, live in the land of quadrilaterals. It is an exciting place to be, but Rect and Rhombella have difficulty accepting each other?s differences. As a result, Rect and Rhombella dispute continuously. Their disagreements cease with self-discovery and a secret from their astute grandfather, Granddaddy Parallelogram. With vibrant color illustrations and accompanying stories children can relate to, the Granddaddy Parallelogram series is a useful tool to teach children advance geometric concepts initially. Children will enjoy entering the land of quadrilaterals and the engaging activities offered to parents and teachers to enhance their children?s knowledge. Experience gratification in math and adventures with the entire Granddaddy Parallelogram series.