California
Family Code – FAM § 8613
(b) Where the prospective adoptive parent is permitted to appear by counsel, the agreement may be executed and acknowledged by the counsel, or may be executed by the absent party before a notary public, or any other person authorized to take acknowledgments including the persons authorized by Sections 1183 and 1183.5 of the Civil Code .
(c) Where the prospective adoptive parent is permitted to appear by counsel, or otherwise, the court may, in its discretion, cause an examination of the prospective adoptive parent, other interested person, or witness to be made upon deposition, as it deems necessary. The deposition shall be taken upon commission, as prescribed by the Code of Civil Procedure, and the expense thereof shall be borne by the petitioner.
(d) The petition, relinquishment or consent, agreement, order, report to the court from any investigating agency, and any power of attorney and deposition shall be filed in the office of the clerk of the court.
(e) The provisions of this section permitting an appearance through counsel are equally applicable to the spouse of a prospective adoptive parent who resides with the prospective adoptive parent outside this state.
(f) Where, pursuant to this section, neither prospective adoptive parent need appear before the court, the child proposed to be adopted need not appear. If the law otherwise requires that the child execute any document during the course of the hearing, the child may do so through counsel.
(g) Where none of the parties appears, the court may not make an order of adoption until after a report has been filed with the court pursuant to Section 8715 , 8807 , 8914 , or 9001 .