In general, a mailing address can be anyone at all's address as long as the addressee (here, the applicant) will receive mail there; and no, it doesn't necessarily mean or require using a representative.Hi, on Im008 form can we right sponsor’s address as mailing address? and if we do that, do we need to fill representative form as well?
Perfectly fine if the applicant receives mail at the sponsor's address, or parent's, or even at the butcher's if that's what works.