Who are they and are they on one of the returns that are being already filed?
It does not matter if they are taxpayers or not. If someone receives insurance through the Marketplace they must either file a return or be included on someone else's return.
Ex. your grandmother is retired, living with your father and has only social security as income so she does not file a return. If your father can claim her as a dependent on his return, then nothing else needs to be done. If your father cannot claim her on his return, then she would need to file a return and include the 1095-A on her return as well using the same steps that you and your brother would use. Meaning, if your father pays all of the premiums for everyone, then she can allocate 0% to herself as well.
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