Instructions: You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Input: Paragraph- Sent 1: Billy and Sally are brother and sister.
Sent 2: Billy is seven and Sally is eight.
Sent 3: Their mother, Deborah, likes to have Billy and Sally dress up in costumes and play a game where they are answering the telephone.
Sent 4: Usually when they play the game, Billy answers the telephone in a loud voice, and Sally answers the telephone in a quiet voice.
Sent 5: On Tuesdays, Billy answers in a quiet voice, and Sally answers in a loud voice.
Sent 6: On Fridays, Billy answers in a loud voice and Sally in a quiet voice.
Sent 7: \tabBilly has blonde hair.
Sent 8: Sally has brown hair.
Sent 9: Deborah has blonde hair, and Billy and Sally's father, Bob, has brown hair.
Sent 10: He tells them to eat lettuce every time that he sees them, so that they grow big and strong like he is.
Sent 11: Deborah likes to add some sugar with the lettuce so that Billy and Sally know what it is like to have sweet tastes in their life.
Sent 12: One day, a Wednesday, Billy throws some lettuce into Sally's hair.
Sent 13: Deborah laughs an grabs some straw from their farm and puts it in Billy's hair.
Sent 14: Billy and Sally live on a farm.
Sent 15: They have a goat, named Joey, and a duck, named Quack.
Sent 16: They sometimes play a game with the goat where they chase him around the farm.
Sent 17: Other times, they play a game with Quack where they wave at Quack and laugh.
Sent 18: They have a fun life growing up on the farm.
Output:
Who are Billy and Sally's parents?