My ex wife and I have been divorced since 2007. She is on SSDI (mental). I have full custody of our son, in fact he doesn't even know she exists. I didn't want or ask for any child support in the divorce agreement. She still receives a monthly check for my son through SSDI. Is this legal since that money was meant to support my son? Should he get the money or the check get cut out all together? We don't need the money per se, just asking.