Autism is largely genetic. We’ve known this for a while now. The percentage of how many people have inherited their autism is debatable but generally, the numbers currently top out at around 80 to 90 percent.
Interestingly, autism could be entirely genetic; we just don’t know right now. Some researchers are unconvinced that the people who have “acquired autism” are truly autistic or if they have a separate condition that simply mimics autism.
Either way, if one’s parents missed their autistic traits, chances are they did so partly because one or both of them were undiagnosed autistic themselves.
I know firsthand how easy it is to miss the signs because I missed them in my son. I missed them because I didn’t know I was autistic.