(a) If, upon such petition so presented and consented, it appears that the child has resided with the petitioner for a length of time sufficient to indicate that the proposed adoption is in the best interest of the child, and the Commissioner of Public Welfare has submitted his report and recommendation with respect to the proposed adoption, and the court is satisfied of the identity and relations of the persons, and that the petitioner is of sufficient ability and in all respects a proper person to bring up the child and furnish suitable nurture and education, having reference to the degree and condition of the parents, and that it is fit and proper that such adoption should take effect, a decree shall be made setting forth the facts and ordering that from the date of the decree the child shall, to all legal intents and purposes, be the child of the petitioner.
(b) If a change of the child's name is requested in the petition for adoption, the court, upon adjudging the adoption, may also adjudge such change of name and grant a certificate thereof without further notice and a copy thereof shall be furnished by the clerk of the court to the proper local registrar of vital statistics.
(c) The original birth record of the adopted child, and all records or files in the custody of any governmental agency or of the court relating to any proceedings under this chapter shall be sealed and thereafter shall not be open to inspection by any person other than the adopted person (if he has attained majority and is not incompetent), except upon the order of the court for good cause shown.