In Lorentz v. Dunn, 112 S.W.3d 176, 179 (Tex. App.--Fort Worth 2003, pet. granted) the court held that plaintiff who was not named personal representative until twelve days after filing suit on behalf of the estate did not have standing at the time suit was filed. In Lorentz, the Court held that the plaintiff's amended pleading did not relate back because the plaintiff, who was not named the personal representative until twelve days after filing suit on behalf of the estate, did not have standing at the time suit was filed, either as an heir or as a personal representative of the estate. Because the petition was filed by a plaintiff who lacked standing, it was a nullity; consequently, any amended petition could not relate back to it. Id.