Austim linked to parent's schizophrenia, depression, personality disorders.
The oldest stereotype in Psychology is, "It's all you mother's fault." They used to blame ADD on "infant head trauma." Yeah, your mom dropped you on your head when you were a baby, it's her fault. "Tell me about yur mudder," in a thick German accent is about as stereotypical psycho-babble as you can get. Not that they ain't right on this, just that Autism technically requires a diagnosis at a young age (like < 3?). So that means that when parents are asking "Why is this happening to our child," doctors are going to say "Well, tell me about your depression/personality disorder. Do you hear voices in your head? Because this Autism, it's all your fault."