OK ... from what I read the ungrateful child will not help their parents get a better PTC result by filing a tax return even if they are not required to file one. I think they need to have a "come to Jesus" talk with the ungrateful child (whom they covered with insurance) to make them "see the light".
If they steadfastly refuse to file a return then there is nothing the parents can do ... they simply report the 1095-A on their return.
