Willow Nigmos (née Muenda) is the deceased sister of Olive Specter. Willow was married to Creon Nigmos and had a daughter with him, Ophelia.
She is deceased before the game begins, and it is said that she drowned. After her death, Willow's daughter, Ophelia, goes to live with her aunt, Olive Specter (Willow's sister). At the start of The Sims 2, Olive is an elder, and Ophelia is a teenager, and they live together in their eerie home in Strangetown (which happens to be haunted by more than a few ghosts). As a ghost, she looks randomized, and her thumbnail will change. The same goes for her husband, Peponi Muenda, Lerato Muenda, Melissa Sims, Vicki Sims, Lyla Grunt, and Luc Smith.
Gallery
Willow's corrupted face.
Trivia
She is very glitchy when resurrected, her face is badly corrupted, and appears deformed and changes constantly. She will be bald, with green eyes instead of brown. It's impossible to change her back to normal except if Dr Vu's Automated Cosmetic Surgeon is used (you will need to completely change her face, but her face is not much different from one of the default, so it is possible to make her look same).
Despite her white hair, Willow is treated as an adult, not an elder.
According to her genetics her hair was red before it turned grey, and despite her thumbnail her genes are for green eyes.
Despite being shown as an elder in her thumbnail she is treated as an adult