Holly first appeared in The Sims 3, where lives in Sunset Valley with her parents. Being a Sim with the Good trait, Holly is the exact opposite of her parents, and she is barely acquaintances with them. She is good friends with Bebe Hart. Although she is only acquainted with the Landgraab Family, she is the only Alto who is not enemies with any of its members.
At the start of the game, Holly has 4 days before becoming a young adult and is a B student in high school. She starts out with 1 skill point in Logic and 2 skill points in Painting, and her inventory contains 5 apples and the satire Exit at Powell.
Oddly, Holly doesn't appear to have any of her parents' genetics, the most obvious difference being that she has arburn hair, while both her parents have dark hair. Because only her parents are shown in the family tree, she may have inherited her hair color from an earlier generation or dyed it. Some players believe that Holly is adopted, but if Holly has a child it can have some of her parents genetics, which implies she most likely got her genetics from an earlier generation.
Some people assume she is Ginia Kat, and changed her name because she was ashamed of her parents. Others believe she is Mom Landgraab. Neither of these speculations has been confirmed.
Life leading up to The Sims 3 (Nintendo DS)
Holly re-appears in The Sims 3 for Nintendo DS, this time with a very different appearance and personality. At this point in time, she is married to Don Alto, who appears to have taken her last name. Her family bio states that her and her husband's motto is "rich, rich, rich" and that many business practices have distanced them from happiness and redemption. It seems that she has inherited her parents' personality, as she has the Evil trait, as well as the Commitment Issues, Outgoing, and Ambitious traits. She also has a very different appearance from her The Sims 3 counterpart. She has brown hair, brown eyes, and dark skin. It may be possible, based on her changed traits and appearance, that she is not the Holly from The Sims 3 but a distant relative. If the theory that Beacon Bay takes place after Pleasantview is correct, she could even be a descendant. These theories have not been confirmed. She is acquaintances with Alexander Goth and Cecilia Goth, and at the start of the game, she and her husband are in the political career, following her mother, Vita, footsteps.
Gallery
Holly Alto outside her house
Holly and her family; Vita and Nick Alto (Mom and Dad)