Jack is an eleven-year-old boy. He has a father, a mother, a grandfather and two brothers in his family. Jack is the youngest (年龄最小的). One of his brothers, Tim, is fourteen years old. The other brother, Mike, is fifteen years old. What’s eleven and fourteen and fifteen? That is Jack’s father John’s age. Jack’s mother is very young. She gives birth to (生下) Jack when she is twenty-five years old. Jack doesn’t know his grandfather’s age. He is very old but very healthy. 
小题1:There are seven people in Jack’s family.
小题2:Jack doesn’t have a sister.
小题3:John is thirty years old.
小题4:Jack’s mother is twenty-five years old.
小题5:Jack’s grandfather isn’t old and he is healthy.