Live Oak Family Health, PA PO Box 349 Seguin, Texas, 78156. Dr. Sullivan will no longer be seeing patients in Seguin after December 31, 2021 Patients seen at Guadalupe Family Health between 7/1/21 and 12/31/21 can contact GFH directly for information: Phone: (830) 379-7901 Fax: (830) 401-0737. All other patients:.