1 EXHIBIT 21 BancTEXAS Group Inc. SIGNIFICANT SUBSIDIARIES The following is a list of all subsidiaries of the Company and the jurisdiction of incorporation or organization. The two nonbank subsidiaries are 100% owned by BancTEXAS. Jurisdiction of Incorporation Name or Organization ---- --------------- NONBANK SUBSIDIARIES -------------------- CSWI International Finance N.V. Netherlands Antilles Sundowner Corporation Nevada Sundowner Corporation owns 100% of: BankTEXAS National Bank National Association