If a testator has no child living when the testator executes the testator's last will, a pretermitted child succeeds to the portion of the testator's separate and community estate, other than any portion of the estate devised to the pretermitted child's other parent, to which the pretermitted child would have been entitled under Section 201.001 if the testator had died intestate without a surviving spouse, except as limited by Section 255.056.
Tex. Estates § 255.054