When you enter the 1095-A, did it have the fathers name on it as well? If so, you can select I shared this policy with another tax payer, then you (or her) and him can agree to allocate an amount to him and to you. Since he pays 100% of the premium, he can claim 100% of the policy. This is NOT required and if they cannot agree, then they both must allocate 50% on each of your returns.
If you end up not able to agree and having to allocate 50% on each return, you do have the option of not claiming her son.
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