thank you for the info, but

here is section 7610: ESTABLISHING PARENT AND CHILD RELATIONSHIP

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7610. The parent and child relationship may be established as follows:
(a) Between a child and the natural mother, it may be established by proof of her having given birth to the child, or under this part.

(b) Between a child and the natural father, it may be established under this part.

(c) Between a child and an adoptive parent, it may be established by proof of adoption.

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If what you said is true, in CA a man has to provide financial support to wife's kids conceive from other man during marriage, I have to say, 真沒天理。