How Many Parents Have More Than One Child on the Autism Spectrum?

What do Ember, Maia, Ronnie57 and many other parents on have in common? They each have more than one child on the autism spectrum.

In a sibling study between 2003 and 2008, the MIND Institute found that the likelihood of parents having a second child with autism was between 15 and 20%.  A 2010 IAN study  reported that out of 1200 families participating, 11% of parents with a child with autism had a second child also diagnosed with ASD.Siblings with Autism
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