Birthday letter from dad is a paper note in Fallout 76, introduced in the Skyline Valley update.
Location[]
Can be found inside the crashed bus at South River Bridge, right next to Birthday letter from mom.
Transcript[]
Happy birthday Sport,
I know It was my weekend to have you, but a couple of the guys wanted to go to Atlantic City. I couldn't just pass up on that.
It sure is lucky your scout group had a special weekend trip-- thought we only got to send you off during the summer! Hopefully a good sign for how I do at the casinos, right? I know you'll enjoy camp more than hanging out with your old man. I promise that when I hit the jackpot, you'll get the best toy a 10-year-old could want.
From Dad.
Ps. Your Mom and Harry will pick you up when its over.