<p>Not sure if this helps much, but I am an undergrad with divorced parents. </p>
<p>My mother has “custody” of me, so I only put her information on my FAFSA, they ask nothing about my father and do not require it since I live under her roof. I highly doubt that your son will need to include his birth father on his FAFSA given your current situation, especially since you are divorced and he provides no support to your son.</p>
<p>If in doubt, just call up the number on the FAFSA website. I called when I was questioning whether my fathers information was required, and they were extremely helpful. Plus, it’s best to make sure you are putting the most accurate information possible on that form!</p>