| Name | Birth date | Relationship with Floyd Williams |
|---|
| Thomas, Arthur Benton | December 3, 1878 | Granduncle |
| Thomas, Benjamin F. | February 1841 | Great-grandfather |
| Thomas, Benjamin O. | 1872 | Granduncle |
| Thomas, Carl Nathaniel | February 17, 1882 | Granduncle |
| Thomas, Dorothy | April 7, 1884 | Grandaunt |
| Thomas, Isaac | WFT Est. 1825-1862 | Husband of the great-grandaunt |
| Thomas, Jacob | Abt. 1815 | 2nd great-grandfather |
| Thomas, Lily | July 9, 1870 | Grandmother |
| Thomas, Lorena | 1866 | Grandaunt |
| Thomas, Minnesota | September 29, 1868 | Grandaunt |
| Thomas, Nora | 1880 | Grandaunt |
| Thomas, Unnamed | April 7, 1884 | Granduncle |
| Thomas, Winona | June 6, 1865 | Grandaunt |
| Thompson, John | | Husband of the aunt |
| Thorson, Don | Private | Brother-in-law |
| Thrinklind | WFT Est. 227-308 | 56th great-grandfather |
| | | 15th cousin 62 times removed |
| Throckmorton, Agnes | WFT Est. 1393-1424 | 17th great-grandmother |
| | | Wife of the half 13th cousin 19 times removed |
| | | Wife of the 16th cousin 19 times removed |
| | | Wife of the 17th cousin 20 times removed |
| | | Wife of the 18th cousin 18 times removed |
| | | Wife of the 19th cousin 18 times removed |
| | | Wife of the 18th cousin 20 times removed |
| | | Wife of the 19th cousin 19 times removed |
| Thyra | WFT Est. 856-875 | 34th great-grandmother |
| | | Wife of the 2nd cousin 35 times removed |
| | | Wife of the 2nd cousin 36 times removed |
| Tireach, Luirreadhack | WFT Est. 239-293 | 55th great-grandfather |
| | | 20th cousin 53 times removed |
| Tirel, Hugh | WFT Est. 1073-1129 | 25th great-grandfather |
| Tolgrach, Fiachadn | WFT Est. Bef. 100 | 82nd great-grandfather |
| | | 86th great-grandfather |
| Towles, Judith | April 23, 1735 | Wife of the 5th great-granduncle |
| Tyrrell, Calfried | WFT Est. 1232-1302 | 21st great-grandfather |
| Tyrrell, Edward | WFT Est. 1196-1273 | 22nd great-grandfather |
| Tyrrell, Hugh | WFT Est. 1110-1160 | 24th great-grandfather |
| Tyrrell, Hugh | WFT Est. 1269-1331 | 20th great-grandfather |
| Tyrrell, James | WFT Est. 1306-1360 | 19th great-grandfather |
| Tyrrell, Roger | WFT Est. 1150-1200 | 23rd great-grandfather |
| Tyrrell, Thomas I | WFT Est. 1384-1413 | 17th great-grandfather |
| Tyrrell, Thomas II | 1435 | 16th great-grandfather |
| | | Husband of the half 14th cousin 18 times removed |
| | | Husband of the 17th cousin 18 times removed |
| | | Husband of the 18th cousin 19 times removed |
| | | Husband of the 19th cousin 17 times removed |
| | | Husband of the 20th cousin 17 times removed |
| | | Husband of the 19th cousin 19 times removed |
| | | Husband of the 20th cousin 18 times removed |
| Tyrrell, Thomas III | WFT Est. 1455-1475 | 15th great-grandfather |