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.

Passage: In a small Texas town, John Kirby, a mentally ill man, kills two members of the family with whom he was staying. Sheriff Daniel "Dan" Stevens and his deputy Charlie, respond and eventually arrest John, but he breaks out of the handcuffs, overpowers the other officers and grabs one of their revolvers, forcing the officers to open fire and shoot John.  
Severely injured and near death, John is transported to an institute where his psychiatrist, Thomas "Tom" Halman, works along with Dr. Phillip Spires and Dr. Paul Vaughn, two doctors and geneticists. To save John, Phillip proposes treating him with a formula created by himself and Paul to enhance cellular strength and regeneration. Tom objects to its use due to John's psychosis, and Phillip pretends to agree but later administers the formula anyway once Tom leaves. Revived and rendered nearly mute but virtually invulnerable, John escapes from the institute and tracks Tom to his home, having overhead Tom telling Phillip to allow John to die earlier. Meanwhile, Dan invites Tom's sister Alison, whom is he romancing, on a trip. John breaks into Tom's home and the two fight. Despite shooting John several times and pushing him down a flight of stairs, Tom is killed. Tom's wife Nancy finds her husband's body and is killed by John as well. Alison arrives to pick up her gear for the trip and discovers her brother and sister-in-law's corpses, but John flees as Dan and Charlie arrive with the police.
Who is dating the sheriff?