Yes, you will say you shared your policy. And then you will need to give your 1095-A to the person who is claiming your son so they can also enter the 1095-A on their return. If they do not enter it on their return as well, it will be rejected.
You can choose to allocate the premiums in anyway that you both agree on. This means you can choose 0% to 100% on your return as long as the other persons amount along with your amount totals 100%.
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