| Family Name | Source of Relationship |
|---|---|
| Tenanty | Related through descendants that are directly connected to "my" Co. Louth McCabe and Murphy families |
| Tepper | Related through my great, great grandparents Michael and Mary (nee Hewitt) Morrissey |
| Thackery | Related through a DNA between me and a Thackery family member. |
| Tracey | Related through the family of my great aunt Mary (nee O'Brien) Murphy. |
| Trainor/Traynor | Related thru my 2x great grandmother, Catherine (nee Trainor) Kernan, and another Trainor family related thru DNA tests. |
| Tierney - Co. Cavan | Related through my DNA cousin Ed Mac Rodain's family. |
| Tierney - Co. Louth | Related through my great aunt Bridget McCabe, daughter of Peter and Bridget (nee Murphy) McCabe. |
| Trapp | Related through a marriage to a granddaughter of my great, great grandparents, Michael and Mary (nee Hewitt) Morrissey |
| Tummon | Co. Monaghan, Ireland - Related thru my DNA link to Winifred (nee Brogan) Tummon's grandniece, Orla Brogan |
| Turtle | Related through connections to my great, great aunt and uncle Margaret (nee Murphy) and John McCabe |