From a legal standpoint, if his dad ships them directly to him across state lines, it is illegal. However, he can ship them directly from himself to himself without the assistance of an FFL dealer. Rifles and shotguns can be mailed via USPS registered mail, or shipped my common carrier (FedEx), but the shipper and the recipient MUST be the same person. Last I heard, UPS would only accept handguns, and they had to be shipped via Next Day Air only.