A bit off topic, but my 60yo brother uses my address as his legal address. He holds dual citizenship - US + other, and he resides mostly in a third country. When my mom passed away, he wasn’t allowed to maintain the inherited assets with a US financial institution with the address of the country where he mostly lives. Since he is basically retired, he also didn’t qualify to have his address in the second country of citizenship.
To make it legal, we actually have a signed lease with him where he rents a room and a garage space from us.
He gets occasional mail at my house, which I open only with his permission if it seems important. Due to COVID, he hasn’t been “home” since June of 2019, so now the mail is starting to pile up!