B

　　According to a new US study，couples who expect their children to look after them in old age should hope they have daughters because daughters are twice as attentive as sons overall.

　　The research by Angelina Grigoryeva，from Princeton University，found that，while women provide as much care for their elderly parents as they can manage，men do as little as they can get away with and often leave it to female family members.

　　Her analysis of the family networks of 26,000 old Americans concluded that gender(性别) is one of the most important things that decide whether or not people will actively care for their elderly parents.

　　ziyuanku.com In a paper presented at the annual conference of the American Sociological Association in San Francisco，she concludes that simply having a sister makes men likely provide less care.

　　ziyuanku.com Using data from the University of Michigan Health and Retirement Study，a study which has been tracking a cross­section of over­50s for the last decade，she calculated that women provide an average of 12.3 hours a month of care for elderly parents while men offer only 5.6 hours.

　　“Sons reduce their relative care­giving efforts when they have a sister，while daughters increase theirs when they have a brother.”

　　“This suggests that sons pass on parent care­giving responsibilities to their sisters.”

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