The parent and child relationship may be established as follows:
(a) Between a child and the natural parent, it may be established by proof of having given birth to the child, or under this part.
(b) Between a child and an adoptive parent, it may be established by proof of adoption.
(Amended by Stats. 2013, Ch. 510, Sec. 2. (AB 1403) Effective January 1, 2014.)