He married twice it seems. The charts prepared by Emma Guy are confusing here. Catherine Plummer was his first wife and Catherine Boor his second wife according to her story. In the top left corner of the relevant chart it indicates Catherine Plummer was a widow and refers to her as a "2nd wife". Her connection with Jane, Martha and Kate etc as shown is unclear to me. The children listed in the database are the eight that seem certain to be connected to Thomas, although who was the mother in each case is also unclear.
Tom was articled to his father and finally became his partner.