". . . By Whom Served; Service of summons . . . shall be made upon any person designated by statute to receive service or as follows:(1) Upon an individual, other than an infant by delivering a copy of the summons and complaint to him personally, or if he refuses to receive it, by offering a copy thereof to him, or by leaving a copy thereof at his dwelling house or usual place of abode with some person residing therein who is at least 14 years of age, or by delivering a copy thereof to an agent authorized by appointment or by law to receive service of summons." ARCP Rule 4.
An in-state Defendant has 20 days to file an answer after personal service.
Generally speaking, any person of "suitable age" can be served if they are at the residence of the individual for whom the Summons or legal documents are intended. Also, a defendant/respondent generally has twenty (20) days to file an Answer assuming that they are in-state.