Tessa reveals her lineage and identity, disclosing that she is Theresa Gray, the daughter of a Greater Demon and a woman who was once human, Elizabeth Gray. Tessa has a rich and complex history, having been married to William Herondale, a prominent figure as the head of the London Institute. Their familial ties connect her to important Shadowhunter traditions and responsibilities.
As a mother, Tessa emphasizes her commitment to raising James and Lucie Herondale with strong values aligned with the Laws of the Clave and Covenant. Her words highlight the importance of upholding the Accords, reflecting the intricate balance between her heritage and the responsibilities she embraced within the Shadowhunter community.