does a suponea, have to be signed by the person its issued for, can it be unsigned and accepted by a 3rd party and be legal?

While I am not specifically familiar with Illinois procedure, in the jurisdictions in which I practice there is no requirement that a subpoena be signed by the person being subpoenaed.  Such a requirement would make no sense. If you're asking whether service was proper because the subpoena was delivered to a family member rather than you, personally, again I am not familiar with Illinois procedure, but in most states service upon a person of suitable age and discretion at the home of the person being subpoenaed would be sufficient, although additional steps (such as an additional mailing) may be required.