California Code, Probate Code - PROB § 6402

(a) To the issue of the decedent, the issue taking equally if they are all of the same degree of kinship to the decedent, but if of unequal degree those of more remote degree take in the manner provided in Section 240.

(b) If there is no surviving issue, to the decedent's parent or parents equally.

(c) If there is no surviving issue or parent, to the issue of the parents or either of them, the issue taking equally if they are all of the same degree of kinship to the decedent, but if of unequal degree those of more remote degree take in the manner provided in Section 240.

(d) If there is no surviving issue, parent or issue of a parent, but the decedent is survived by one or more grandparents or issue of grandparents, to the grandparent or grandparents equally, or to the issue of those grandparents if there is no surviving grandparent, the issue taking equally if they are all of the same degree of kinship to the decedent, but if of unequal degree those of more remote degree take in the manner provided in Section 240.

(e) If there is no surviving issue, parent or issue of a parent, grandparent or issue of a grandparent, but the decedent is survived by the issue of a predeceased spouse, to that issue, the issue taking equally if they are all of the same degree of kinship to the predeceased spouse, but if of unequal degree those of more remote degree take in the manner provided in Section 240.

(f) If there is no surviving issue, parent or issue of a parent, grandparent or issue of a grandparent, or issue of a predeceased spouse, but the decedent is survived by next of kin, to the next of kin in equal degree, but where there are two or more collateral kindred in equal degree who claim through different ancestors, those who claim through the nearest ancestor are preferred to those claiming through an ancestor more remote.

(g) If there is no surviving next of kin of the decedent and no surviving issue of a predeceased spouse of the decedent, but the decedent is survived by the parents of a predeceased spouse or the issue of those parents, to the parent or parents equally, or to the issue of those parents if both are deceased, the issue taking equally if they are all of the same degree of kinship to the predeceased spouse, but if of unequal degree those of more remote degree take in the manner provided in Section 240.