Edward Tanios

In the novel Dumb Witness, Edward (or John) Tanios is the son of Bella and Jacob.

Edward resembles his father in appearance, but he and his sister, Mary, have a "definitely foreign-looking appearance".

Later in the novel, Bella leaves her husband, and takes Edward and Mary to Wilhelmina Lawson's home. Miss Lawson gets them rooms at the Wellington Hotel, in Queen's Road. Poirot later advises Bella to take the children to the Coniston Hotel near Euston.

While at the Coniston Hotel, a man arrives with a note for Bella. She later comes down with the children and a suitcase, and the children leave with the man.

Naming
The son of Bella and Jacob Tanios is mentioned as Edward and, twice, as John in the novel. The boy is mentioned by name by his mother in Chapters 2, 16, 17 and by his father in Chapters 2 and 17 as well. At any other time, they are mentioned as "the children". At the very end of Chapter 16 in one print version, when Bella, her daughter Mary and Poirot are joined by Jacob Tanios and their son, Poirot asks Bella a question and she replies: "When do you return to Smyrna, madame?" "In a few weeks' time. My husband – ah! here is my husband and John with him."

At the start of Chapter 17, Jacob Tanios then calls his son John: "Here we are," he said, smiling to his wife. "John has been passionately thrilled by his first ride in the tube. He has always been in buses until today."

Other print versions have more switches between John and Edward (in Chapter 2 a few sentences apart, for example).

However, in the audiobook edition read by Hugh Fraser, the boy is always called Edward, even in those two instances where the print version has the wrong name. Thus they are termed errata. It is not clear when the errata were corrected for the audiobook.