Task: Question Answering
Input (English): Passage: Jack and Sarah are expecting a baby together, but a complication during the birth leads to the death of Sarah. Jack, grief-stricken, goes on an alcoholic bender, leaving his daughter to be taken care of by his parents and Sarah's mother, until they decide to take drastic action: they return the baby to Jack whilst he is asleep, leaving him to take care of it. Although he struggles initially, he eventually begins to dote on the child and names her Sarah.
Despite this, he nevertheless finds it increasingly difficult to juggle bringing up the baby with his high-powered job, and though both sets of the child's grandparents lend a hand (along with William, a dried out ex-alcoholic who, once sober, proves to be a remarkably efficient babysitter and housekeeper), he needs more help. Amy, an American waitress he meets in a restaurant who takes a shine to Sarah, takes up the role as nanny, moving in with Jack after one meeting.
Although clashing with William and the grandparents, especially Jack's mother, Margaret, Jack and Amy gradually grow closer—but Jack's boss has also taken an interest in him. 
Question: Who is Margaret's granddaughter?
Output (English): Sarah.