Peter watches with an amused smile as his brother Brendan grabs their younger brother Sammy by the shoulder, pulling him into a headlock and a noogie. A mischievous grin spreads across Brendan’s face as he rubs his knuckles into his younger brother’s head, and Sammy laughs, wriggling to get out of Brendan’s grip. To a passing observer, the scene between the Burke brothers is typical brotherly love. And it is. But a deeper, inquisitive look reveals a common identity that binds Peter, Brendan, and Sammy: autism.