How To Write A Family Christmas Letter . Description how to write a christmas letter to family and friends. The main thing is to have fun with the letter, make it personal and add a bit of humor to the writing. anna and ian life on the green line Our 2008 Christmas Letter from annakristina28.blogspot.com Remember there is no format here to follow so it can be written however a person sees fit. Write with sincerity and genuineness. Let your personality shine through.