(a) This chapter shall be liberally construed, and all relationships set forth in this chapter shall include the adoptive, foster, and step relations as well as blood relations and the relationship by common-law marriage as well as ceremonial marriage.
(b) A consent by one person authorized and empowered to consent to surgical or medical treatment shall be sufficient.
(c) Any person acting in good faith shall be justified in relying on the representations of any person purporting to give consent, including, but not limited to, his identity, his age, his marital status, his emancipation, and his relationship to any other person for whom the consent is purportedly given.
(d) A consent to surgical or medical treatment which discloses in general terms the treatment or course of treatment in connection with which it is given and which is duly evidenced in writing and signed by the patient or other person or persons authorized to consent pursuant
to the terms of this chapter shall be conclusively presumed to be a valid consent in the absence of fraudulent misrepresentations of material
facts in obtaining the same.