Your fate depends on your actions and if you do it right everything will be fine. Something is going to happen on your birthday. How do you know that? You've got a mail at the celebration, so be careful!
This it your memories about the childhood, not the happiest memory of your life. However, you should experience it again and who knows where it will lead you. Collect items and help your parents and grandpa to have fun at the celebration. Pay much attention on the details as they are crucial at this moment.