| Name | Birth date | Relationship with Marian Yancey |
| Thomas, Tracie Marie | | 2nd cousin twice removed of the husband |
| Thompson, Rodney Lee | | 2nd cousin twice removed of the husband |
| Thompson, Steven Allen | | 2nd cousin twice removed of the husband |
| Thorley, Christy | | 1st cousin once removed of the husband |
| Thorley, Dale Richard | | 1st cousin once removed of the husband |
| Thorley, David James | | 1st cousin once removed of the husband |
| Thorley, Dean Michael | | 1st cousin once removed of the husband |
| Thorne, Maude | | Wife of the 4th cousin twice removed |
| Thull, Brent | | 3rd cousin |
| Thull, Brent | | 3rd cousin |
| Thull, Jack | | Husband of the 2nd cousin once removed |
| Thull, Michelle | | 3rd cousin |
| Thull, Michelle | | 3rd cousin |
| Thull, Rita | | 3rd cousin |
| Thull, Rita | | 3rd cousin |
| Thull, Steven | | 3rd cousin |
| Thull, Steven | | 3rd cousin |
| Thull, Tommy | | 3rd cousin |
| Thull, Tommy | | 3rd cousin |
| Timothy, Brett Micheal | | 3rd cousin twice removed of the husband |
| Timothy, Justin Dewayne | | 3rd cousin twice removed of the husband |
| Timothy, Matthew Wade | | 3rd cousin twice removed of the husband |
| Timothy, Zachary Scott | | 3rd cousin twice removed of the husband |
| Tinkle, Amanda Rose | | 2nd cousin twice removed of the husband |
| Tinkle, Jonathon Blake | | 2nd cousin twice removed of the husband |
| Tiska, ??? | | Husband of the great-grandaunt |
| Tiska, John | | 1st cousin twice removed |
| Tiska, John | | 1st cousin twice removed |
| Tiska, Phyllis | | 1st cousin twice removed |
| Tiska, Phyllis | | 1st cousin twice removed |
| Tomaszewska, Evelyn | | 6th cousin |
| Tomaszewska, Frances | | 6th cousin |
| Tomaszewski, Arthur | | 5th cousin once removed |
| Tomaszewski, Arthur | | 6th cousin |
| Tomaszewski, Franciszek | | Husband of the 4th cousin twice removed |
| Tomaszewski, Robert | | 6th cousin |
| Tomredle, Karen Louise | August 11, 1950 | Ex-wife of the 1st cousin |
| Tracikowska, Franciszka | | Wife of the 4th cousin twice removed |
| Truszkowska, Teofila | 1840 | Wife of the 3rd cousin 3 times removed |
| Tucker, Bridget | Abt. 1771 | 4th great-grandmother |
| Tyrajska, Maryanna Lucya | December 11, 1819 | Wife of the 2nd cousin 4 times removed |
| Ugorowska, Stefania | October 20, 1890 | Wife of the 4th cousin twice removed |
| Valenta, Frances | September 21, 1919 | Wife of the 5th cousin once removed |
| Valentine, Janelle Victoria | | 2nd cousin twice removed of the husband |
| Valentine, Kerri Sue | | 2nd cousin once removed of the husband |
| Valentine, Ronald Brian | | 2nd cousin once removed of the husband |
| Valentine, Sandra Kay | | 2nd cousin once removed of the husband |
| Van Camp, C. | | 4th great-grandfather |
| Van Camp, Jane | March 07, 1824 | 3rd great-grandmother |
| Van Camp, Rachel Ann | March 13, 1817 | 3rd great-grandaunt |