Two sisters, no love lives. Both end up dating the same man, and inviting him to meet the family on December 17th. He doesn't know there are two sisters or that he committed to two different dates on the same day.
The Banks family, a respectable Californian family, take in a relative - Will Smith, a street-smart teenager from Philadelphia. The idea is to make him respectable, responsible and mature, but Will has got other plans...