Dear Teddy,
Happy fifth birthday! I hope you have an excellent birthday, one much better than my own fifth birthday. That wouldn't be a huge accomplishment though, considering that I received a werewolf bite for mine. Oh dear, that's not too depressing, is it? I'm also hopeful that that didn't come as a shock. Yes, your father was a werewolf. I was truly terrified of passing my own condition onto you, but the full moon came a day or two after your birth and you remained human as ever. Even if you had been a werewolf, we would have loved you just as much and I would have had company on the full moon. That was supposed to be light-hearted, really.
I suppose humour isn't my forte.
Love, your Dad