Yes, you can enter his 1095-A information on your return if you claim him as a dependent. If he had no income and you claim him as a dependent, he would not be required to file his own tax return.
You would not be responsible for his tax liability if he is just a dependent on your return, other than if there is a payback required for the Advanced Premium Tax Credit. Because you are claiming him as a dependent, you would be responsible if he is found ineligible.
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