Char and Russ Dasrup have one daughter, Siera, who is 16 years old. In November of last year, the Dasrups took in Siera's 16-year-old friend Angela, who has lived with them ever since. The Dasrups have not legally adopted Angela but Siera often refers to Angela as her "sister." The Dasrups provide all of the support for both girls, neither girl receives any income during the year, and both girls live at the Dasrups' residence. Which of the following statements is true regarding whom Char and Russ may claim as dependents for the current year?