How can you actually have a "white picket fence and 2.5 kids"?

.5 kids thing is a joke that the youngest child in a family of three probably wasn't planned for and is most likely doomed to never grow up properly and remain emotionally immature.
 
.5 kids thing is a joke that the youngest child in a family of three probably wasn't planned for and is most likely doomed to never grow up properly and remain emotionally immature.
I thought the .5 was because it was an average and most had between 2 and 3 so the average just shifted inbetween.
 
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