Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: Zac is a lonely, highly strung city trader on the edge of a psychological breakdown. He has lost everything—his job, his girlfriend Eva (Sophia Di Martino from "Flowers") and, most devastatingly, his weird and wayward younger sister Alice, the only family he had left. Alice is now a missing person, having disappeared on a narrow boat trip along with her kindred drifter and boyfriend Toby. Zac becomes increasingly frustrated with the futile attempts of the police to find them and, eventually, decides to take matters into his own inexpert hands by starting a terribly executed video blog and scouring the dark canals of the UK in a desperate, perhaps even deluded search for clues. Struggling for information and fast losing hope, Zac reflects on his past and the difficult relationship he had with Alice. Wracked with guilt and regret, his sanity starts to unravel as he fights with memories of her in the weeks leading up to her disappearance. As he remembers her sweetly burgeoning relationship with the mysterious Toby, however, he begins to wonder if there may in fact be a grander, wilder, much stranger explanation for their disappearance.
A:
Who is missing along with Zac's only family?