dianew

My son has the DTC and zero taxable income. He also has a dependent child. Head of household has Disability amount transferred to him. How, then, can I show the dependent child of my son? There is nowhere for me to enter dependent if son is filed as a dependent. Son needs to be able to receive the Child Tax Benefit. I filed son as a dependant, then did and paid for another return showing his dependent and filing of that was rejected as "already filed". HELP