Thatcher Karsten (James Cromwell) is the father of T.J. Karsten and Elaine McAllister, the father-in-law of Jack McAllister, the grandfather of Elaine & Jack's two children, Val and Vic, and a main character in the ABC drama Betrayal. His son, T.J., is facing murder charges after the untimely death of Thacher's brother-in-law, Lou.
- Father of: T.J. Karsten
- Father of: Elaine McAllister
- Father-in-law of: Jack McAllister
- Grandfather of: Valerie McAllister
- Grandfather of: Victor McAllister