阅读短文，判断下列句子正误。

It's a fine day today. The sun is in the sky. Mr. Green and his family are in the park. Mr. and Mrs. Green are standing under the trees and looking at their children. Ann is flying a kite. The boy in a white shirt and blue trousers is her brother. He's reading a book. Ann's younger brother is too young. He can't walk or run. He's drinking milk. Ann's sister isn't in the park. She is at school.