Recurrence of Autism Spectrum Disorders in Full- and Half-Siblings and Trends Over Time

Source: 
JAMA Pediatrics
Abstract: 

Children who have an older sibling with autism are seven times more likely than other kids to be diagnosed with autism themselves, according to a new study from Denmark. A higher-than-average risk was also detected for children who have a half-sibling with ASD, especially if the two children had the same mother.