There are two doctors in Houston doing this research on trauma victims - not ‘stroke’ victims like your son, now. Baumgartner and Cox
http://www.uthouston.edu/Media/newsreleases/nr2005/stemcell-child.html
http://clinicaltrials.gov/ct2/show/NCT00254722?term=stem+cells+and+brain+injury&rank=1
It’s for kids who were physically injured within 24 hours.
I’m sorry, but I don’t see any studies on chronic injuries. However, your family and grandson’s neurologist should watch this page, with the search words, stem cells AND stroke or Stem cells AND anoxic brain damage or
He didn’t have a heart attack or stroke. He suffers from anoxic/hypoxic injury (lack of oxygen to brain)