What would you consider

My family makes 50,000 a year,  my sip made the remark that she doesn't understand how we live off a lower class income with a family of 3 living in a small city in southern Indiana.
 I didn't take much into what she said since she's 34 and single and lives with still lives at home  and is a pizza delivery driver.
But it makes me wonder what do people think is consider lower and what's considered middle.  

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