Erin, Titus, Dave, and Tommy attempt to throw a surprise sixteenth birthday party for Amy, but the plan goes awry when Child Protective Services become involved.
Grandma Titus is suffering from dementia and shows up at the high school intending to teach classes. The guys show up to rescue her and Titus reflects in how she shielded him from his father and other family dynamics.
As they fly home after Juanita's funeral, Titus reads an article about how insanity is genetic while everyone else manages to piss off both passengers and stewards.
After the ruckus on the plane, the FBI threatens to label the gang as terrorists... unless they sign the commitment papers to put Titus in an institution.