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California Probate Code:
"6450. Subject to the provisions of this chapter, a relationship of parent and child exists for the purpose of determining intestate succession by, through, or from a person in the following circumstances: (a) The relationship of parent and child exists between a person and the person's natural parents, regardless of the marital status of the natural parents. (b) The relationship of parent and child exists between an adopted person and the person's adopting parent or parents."
So the answer is Yes.
There are multiple cases that agree with my answer cited in the case posted at
which construed an earlier version of the statute I quoted.
See also Estate of Heard where the Court states, at age 521: The word "issue" is there used in the same sense as the words "child" and "children."
I hope this information is helpful.