My parents bought Tony Attwood's Guide To Asperger's Syndrome after my previous therapist "highly suggested" that I have it. I'm the only one in my household who read it. Granted, though, my parents do not read much in the first place.
After eighteen years of dealing with me, my father still cannot understand why I dash around the house, do not socialize "enough," or am hypersensitive. They are under the impression, however, that since I do occasionally eye contact, drive, and am an honors student in regular education, that I either do not have "it" or that "it" is not severe enough to matter (the latter of which may actually be true).
I can't speak for your parents, but my parents were raised in an era and culture (The South, 50's and 60's) in which any issue that did not confine one to a bed or wheelchair should be "gotten over," that children should "grow up and toughen up," and that any negative emotion can be overcome with enough willpower.
To their credit, though, they do try to compromise on what they do understand: they make allowances for the fact that I got "worn out" easily, that I am clumsiness, and that I cannot take intense emotions for an extended period of time (well, they're still working on the last one, but they're trying).
I do hope that things improve for your environment. It may help if they were to watch a (credible and accurate!) documentary on autism or Asperger's--many people prefer watching to reading. My Autism And Me from BBC, though not the most information filled, is a "cute" place to start, if your parents are interested in "cute" things (the narrator is a 13 year old British Aspie Girl). There's also a movie on Temple Grandin (titled, simply, Temple Grandin). I've never seen it, but the preview I saw for it looked amazing.
Best of luck to you and your family.