Some people have also identified a "broad autism phenotype"-- that there are people who have enough traits to seem unusual, but not enough to get diagnosed as autistic. This often includes the siblings or other family members of people diagnosed as on the autism spectrum. There really is a big borderline area.
My DH had a hard time with my DD's diagnosis, his response to me at the time, (being the class clown that he is), "it's just your genes".
There are times my DD seems neurotypical, and times when it's blatantly obvious she is not, sometimes she's just so much like me it's scary.
