Go to NACD.org (National Association of Child Development.) They are in Salt Lake City, Utah. My sister had dyspraxia, which is more severe than dyslexia. When my sister was a child, the special educators available in public school told my mother that she would probably never be able to speak. They gave up on her. My mother heard about the NACD and took her there. Today, my sister can speak like everyone else. They changed her life. The NACD says on their website they can treat dyslexia and autism. I don't know about ADHD, but I would not be surprised if they could help with this as well.
CarolCB, I am praying for you with you for you and your family🙏
CarolCB, I am praying for your grandson.