spinocerebellar ataxia

I read in the handbook about spinocerebellar ataxia and possible relation to CPNi.  I only found one mention in one article from a couple of years ago on my search of the site.  Anyone with spinocerebellar ataxia or know anything about it?  My dad(step-but really my dad) was diagnosed with spinocerebellar ataxia Type 6.  He is completely diabled-in a scooter or w/c, able to transfer short distances, has garbled speech, is homebound, has had bypass surgery, can't provide for he and my mom and fights depression(who wouldn't)?  As I have looked at cpn for me, I am beginning to wonder-am just about convinced- that he has it also and may be able to regain some function with treatment.

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Mel W.  asthmaii for 20 years, PCOSii, insulin resistant, hypothyroid, high cortisol, low ferritin, low D3.  Recent PCRii-PCN not detected.  Dr. treating empirically.  Doxyii 200mg.  Azith 250mg MWF 11/10.  First Flagylii pulse 12/28-500mg/day X 3 days.  NACi-240