How can i tell if my son is suffering from either early onset parkinson's or ataxia telangiectasia?

How old is he? What: are his symptoms? I assume he is an adult, in which case you can only encourage him to see his primary care provider. If your son has altered gait, tremors &/or other neurological signs & symptoms, he'll probablybe referred to a neurologist. Such symptoms warrant evaluation & treatment, but it's his choice to seek medical care.