Yes, they have to file their own return so that they can show form 8962 because their name is on the policy; however, that does not mean you have to amend your return if they indicate that they are being claimed as a dependent on their return.
Note that you may need to go back and update your 1095-A to show that you will take 100% of the allocation. In this case, your dependent will take 0%. This is normal for parents who actually got the Premium Tax Credit and dependents who didn't have anything to do with it.
Have them claim 0% on their 1095-A when they enter it. It's possible that IRS may eventually realize that the dependent asked for 0% allocation while you did not ask for 100% allocation, and they write you a letter asking you to update your 8962 form. If so, do whatever they ask.
Yes, they have to file their own return so that they can show form 8962 because their name is on the policy; however, that does not mean you have to amend your return if they indicate that they are being claimed as a dependent on their return.
Note that you may need to go back and update your 1095-A to show that you will take 100% of the allocation. In this case, your dependent will take 0%. This is normal for parents who actually got the Premium Tax Credit and dependents who didn't have anything to do with it.
Have them claim 0% on their 1095-A when they enter it. It's possible that IRS may eventually realize that the dependent asked for 0% allocation while you did not ask for 100% allocation, and they write you a letter asking you to update your 8962 form. If so, do whatever they ask.