The Baker family is a pre-made family in The Sims 3, found in the Family bin at the start of the game. Married elder couple Svetlana and Heathcliff live with their young adult daughter and their grandson Topher. It is possible that Heathcliff is related to the Bakers of Twinbrook, however, there is no evidence to support this relationship.
Topher: a shortened form of Christopher. It means 'Christ Bearer'.
Svetlana: The Slavic of "light".