I have a younger brother.His name is Yin Chenyue.He is 12 years old.His birthday is December 15th.He has a pair of big eyes. 　 He usually gets up at around 6:30 am.His favourite subject is math.It's difficult but interesting.Last class he always play ping-pong ball.Becauce he likes playing sports very much.I love him.We are good friends. 　 I hope everybody likes him.