It is very possible that your grandson does not display any focal neurological problem - i.e., that there is no brain lesion or anything else grossly wrong from a neurological perspective. Thus, he would be deemd 'normal' by the neurologist. However, his psychomotor restlessness and his angry reaction to frustration and limit setting are not within the normal spectrum. It is likely he displays a hyperactivity syndrome typical of youngsters who exhibit Attention-Deficit/Hyperactivity Disorder. He should be evaluated re: this possibility. Further, his angry reactivity requires a systematic behavior management plan, of the sort that you can see described in Lynn Clark's book SOS Help for Parents. When he is being evaluated re: ADHD, it would be prudent to call the clinician's attention to his problematic angry behavior as well. The clinician can offer guidance and support to his parents.