When Carol tells Mike she's expecting an addition to the family, eavesdropping Cindy and Bobby think that Carol is pregnant and pass the rumor along to the rest of the family. But the new addition isn't a baby, it's Carol's nephew Oliver, a clumsy boy who seems to bring trouble wherever he goes.

When an FBI agent visits to check Mike's security clearance, Bobby and Oliver become convinced that Mike is working on plans for a top-secret project. They also suspect Sam of being an international spy scheming to steal the plans.