Hey dad,
I know a lot of these are depressing and generally not fun letters but I just haven't been as happy as I used to be. And I pretended to be happy for a very long time.
It sucks that you're not here anymore but I know you're up there with your parents watching over us. Watching us triumph over challenges and fail at others, but still having that drive to persevere.
We miss you.
Love,
Nasri