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When his sons were very young, Tobias and William's father came to the aid of Felix Blackthorn, a friend of his, to present a united front against Inquisitor Dearborn when he came asking after Felix's daughter Annabel. Aware of what had befallen Annabel, Tobias's father suggested to Dearborn that maintaining the illusion of Annabel's becoming an Iron Sister would be beneficial to Shadowhunters, as it would keep Malcolm Fade loyal to them. Due to this, Dearborn agreed to cease his investigation.
The encounter between Dearborn, Tobias's father and his companions was recorded and stored on an aletheia crystal, which was hidden outside the Cornwall Institute until it was found in 2012 by Kit Herondale and Tiberius Blackthorn.
Tobias's father was a hard and stern man. Despite his fierce obedience of the Law he held little regard for justice, if it benefited Shadowhunters as a whole, shown in his willingness to cover up the murder of Annabel even though it was a major crime amongst the Nephilim. He also had no qualms about manipulating and using Malcolm Fade to the Clave's advantage.
Tobias's father had dark hair and an aristocratic look.