Participants will be 40 triads consisting of mother, father, and child with ASD and 40 triads of mother, father, and typically developing (TD) children. Families will come to our lab at UCSF's Parnassus campus for one 2-hour visit. Parent dyads will be randomly assigned to receive either OT or placebo immediately before the triad engages in triadic discussion and play tasks. We will monitor mothers', fathers', and children's physiological and behavioral responses during these tasks. In summary, this is a randomized 2 (diagnosis) x 2 (spray) between-subjects study of triadic physiology and behavior in children with ASD or TD in which both mothers and fathers are given either OT or placebo.