My personal exemption went from $10,240 to $2,916. Why such a huge drop? Only difference is that one of my two children had summer internship income greater than $6000.

Personal Exemption went WAY down - more than $7000 - in 2016.  My wife and I are filing jointly had have two children, both under 22 and both full-time students.  The only thing that changed is that my son had summer internship income greater than $6,000.