(iii) Proposed provisions specifying that the USPS shall not transmit mail-in or absentee ballots from any individual unless those individuals have been enrolled on a State-specific list described in subsection (b)(iv) of this section with the USPS pursuant to this subsection.


I went back and reread it, and it says there’s an exemption if you all live in the same household. So I think if you live with your parents you can be designated for both of them, but if they live separately from you, you could only do one.
County drop box rules
And then from the agent form: