The Johnstons are an average of seven American families pursuing the American dream. Papa Trent and Mama Amber have five children under the age of 16, all with achondroplasia dwarfism.The Johnstons are an average of seven American families pursuing the American dream. Papa Trent and Mama Amber have five children under the age of 16, all with achondroplasia dwarfism.The Johnstons are an average of seven American families pursuing the American dream. Papa Trent and Mama Amber have five children under the age of 16, all with achondroplasia dwarfism.