Sarah arrived at Biff's house, and rang the doorbell.
Biff's mother, Lorraine, let her in. She seemed surprised to see Sarah. "Come in," she said.
The entire family, it turned out, was sitting at the dining room table. Gary, Biff's father, Biff himself, and Wesley, Biff's younger brother.
"Why don't you join us?" Lorraine said.
