Malfoy, Narcissa

From Wikipotter

Narcissa Malfoy, is the wife to Lucius Malfoy and mother to Draco Malfoy. She is sister of Bellatrix Lestrange.

In the Deathly Hallows, when Voldemort performs the killing curse on Harry, Narcissa is told to check whether he is alive or not. Narcissa knew he was alive, but because he told her that Draco her son was still alive, she told Voldemort he was not alive. Hagrid was then made to carry him in to Hogwarts, still not knowing he was alive.