reference only, always ask tax professional !

Answer your question: Federal
1040 form: Hu*****and’s income + wife’s income-$10,000-3,200x3=taxable income
1040 EZ form: Son’s income -$5,000= taxable income, if he made less than $5,000 taxable income is zero, all the money withheld from w-2 line 2 will be refund for him.
for state:
some state allow you claim the same personal exemption as your federal return, some allow you claim only you and your wife personal exemption, and your son claim his own personal exemption, check from state website.
Medical and SSTax can not be refundable most of the time, unless you are non resident alien.