For around $5/month, you can rent a PO box at a US Post Office and as long as your family mails your stuff through the post office, large packages will be held behind the counter for you to pick up. I think the shortest term you can rent for is 6 months. Also, some post offices will let you use your PO box number and the post office street address for non USPS delivers (like fedex or amazon or whatever), but it's probably for an additional fee.