Dear xx(your brother's name)
How is everything going in America? I hope this letter finds you well. I haven't got in touch with you for about an year and I miss you so much. I always want to write to you but I don't have spare time at all.
I am thinking that we should write to each other at least once a month in English.What do you think? I don't want to lost contact with you. Could you send me couple recent pictures of yours? All the family miss you and want to see how do you look like now? How is your studying over there? Tell me something about your university work.
Looking forward to hearing from you soon.
Yours
Chen Lin