I'm with Spero on this. The poor lad may be friendly with lots of autistic people, and be suggesting that his undiagnosed father lies somewhere on the spectrum.
I have read quite a lot on this subject, and there seems to be a decent case that lack of empathy is a feature of autistic conditions, though sufferers often lack cognitive rather than affective empathy. This means that if they did spot that another person was upset, it could affect them a lot, but they might not work it out, because they had missed the social cues.