The Glass House (2001) on Netflix

When Ruby and Rhett Baker's parents are killed in a car accident, their carefree lives are suddenly shattered. Moving into an incredible house in Malibu with the Glasses - old friends of the family - seems to be the beginning of a new life for them. But Ruby soon stumbles upon information that leads her to suspect that her new guardians might somehow be responsible for her parents' deaths. Now she finds herself all alone in a duel of wits with the ruthless couple - and she's the only thing standing between them and her $4 million inheritance.