In In re SWEPI, L.P., 85 S.W.3d 800, 45 Tex. Sup. Ct. J. 1234 (Tex. 2002), the real party in interest argued that the relators were not entitled to mandamus relief for a probate court's ruling on a plea to the jurisdiction because an adequate appellate remedy existed. Although we recognized that pleas to the jurisdiction will not ordinarily be reviewed by mandamus, we granted mandamus relief because the probate court erroneously interfered with another court's jurisdiction: "The probate court not only erroneously concluded that it had jurisdiction, but also actively interfered with the jurisdiction of the Harris County court." In re SWEPI, 85 S.W.3d at 809).