To my beloved elder sister:
Happy birthday to you! Hope you have a wonderous day and receive lots of presents. One more year has passed and we have alll become a bit more mature than before. During the course of life, we will all change, meet new people and go to new places. But for me, you will always be my beloved elder sister who has always looked after me and taken care for me.
May this day be ever so special~
Love,
(your name)
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呵呵,不大知道你姐姐是什么性格,就猜测着写了这个,虽说有点煽情吧,但是送姐姐,自我感觉还是不错.希望对你有帮助.
天~
p.s.话说祝贺信写太长了也没意义~