Hello!
Sorry to hear that you are feeling unwell.
I hope that you will be better soon.
Now, about this letter. Maybe it's a good idea for your friend to write to your Dad ~ or maybe not.
I suppose it rather depends on how your Dad might react.
Since you are more likely to know than he is, then, yes, I rather think that it would be as well if you read it first.
But then again, I may be wrong
