When a testator omits to provide in the testator's will for any child of the testator, or for the descendants of a deceased child, and it appears that the omission was made by mistake or accident, the child or descendants, as the case may be, shall have and be assigned the same share of the estate of the testator as if the testator had died intestate. (Added 2009, No. 55, § 5, eff. June 1, 2009; amended 2017, No. 195 (Adj. Sess.), § 3.)