California Code, Probate Code - PROB § 21621

(a) The decedent's failure to provide for the child in the decedent's testamentary instruments was intentional and that intention appears from the testamentary instruments.

(b) The decedent had one or more children and devised or otherwise directed the disposition of substantially all the estate to the other parent of the omitted child.

(c) The decedent provided for the child by transfer outside of the estate passing by the decedent's testamentary instruments and the intention that the transfer be in lieu of a provision in said instruments is shown by statements of the decedent or from the amount of the transfer or by other evidence.