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1.
The typical family depicted on television commercials which depict a happy, loving, tight family enjoying whatever item that the commercial is depicting. Sadly, this is not the way that most real life families act.
John: "Dad we need to get a Kinect!! Look how happy that family is!!"

Brother: "Dude, can't you tell that's just a Nuclear Family? The Kinect won't bring that kinda happiness!"
by Scyon May 24, 2011
 
2.
A family comprised of a mother, father, and at least 1 full child (child of both parents). Something that is non-existent in today's society.
Back in the day, families stayed together for life and existed as a nuclear family! Now, families always split.
by MetalHead16 November 21, 2010