What reason did Graham's parents have for frequently visiting Dr. Dressler?

Graham's parents frequently visited Dr. Dressler because they believed he was a genius. This belief likely stemmed from their observation of Graham's exceptional abilities or potential, leading them to seek guidance or stimulation for his intellectual growth. When parents perceive their child as exceptionally gifted, they often take actions to nurture and enhance that talent, which in this case is reflected in their regular consultations with a specialist. This could include seeking advanced resources, educational methods, or opportunities that align with their high expectations for their child.