There is a dad and his autistic son that I see riding on a rail to trail here in northern Baltimore. I find it SO heartwarming. His son appears to be happy and fit - as is the dad. I've been watching them ride on their tandem for about the last 5 years - the son must be close to his 20's by now. I have a few friends with autistic sons and I always relay this to them. I'm sure its a challenge - but riding a tandem is a challenge for any couple....
WTG Butcher and Fred!