A farmer has five sons.They are Ted,Bob,Tom,John and Bill. John has no elder brother. He was four years older when his first younger brother was born. The number of Tom's elder brothers is equal to his younger brothers. Bill will be twenty-one years old next year, and he is five years older than Bob. Bob is two years younger than Tom. Ted was sad because he has no younger brother. There are twelve years between him and John.

　　一个农民有5个儿子。他们是Ted,Bob,Tom,John 和 Bill。John没有比他大的哥哥，他比第一个出生的比他小的那个弟弟大4岁，Tom哥哥的数量和他的弟弟的数量是一样的(就是他是老三)Bill 明年就21岁了，他比Bob大5岁，比Tom小2岁，Ted因为没有弟弟而难过 Ted 和John之间差了12岁