The Vasquez family is a wealthy family living in the neighborhood of Moonlight Bay. The family consists of Tyler Vasquez, his pregnant wife, Heather Vasquez and Heather's daughter, Elaine Austen. Elaine doesn't seem to get along with Tyler or Heather very well, even though a new baby is on the way. They are one of the few families that the player has an option to play as. Heather often gives birth to a daughter, thus giving Elaine a half-sister. It is the player's choice to decide whether to mend Tyler & Elaine's relationship. Elaine displays characteristics of a wild-child and probably acts as a social speed-bump to Tyler's high-flying political career.
There is a Vivienne Vasquez living in the downloadable neighborhood of Lucky Palms. Whether they are related to Vivienne is purely speculative and is up to the player's imagination. There's also a Vasquez family in Sims 3 Midnight hollow who they might also be related to.