Artie and Diane agree to look after their three grandkids when their type-A helicopter parents need to leave town for work. Problems arise when the kids' 21st-century behavior collides with Artie and Diane's old-school methods.

Fabricating credentials to score a last-ditch job as a high school guidance counsellor, a boozing, drug-addled former child star becomes an improbable hit with his students by dispensing the worst advice possible.