Anne and John adopted a mundane child, Mortmain, and raised him as their own son.
At one point, Anne and John were murdered by Shadowhunters on the grounds that they were conspiring to destroy Shadowhunters. Aloysius then kept her blood in a jar and her cloak among his collection of spoils. Their adoptive son saw the injustice in his parents' murder and filed for recompense through the York Institute, insisting that Anne was murdered without reason since she didn't know her husband's plans. When Aloysius Starkweather refused Mortmain's wishes, he grew spiteful towards Shadowhunters and began to plot his revenge.