<human>: So I was the result of a "one night stand". My mother's favourite mistake, to put it nicely. I spent most of my childhood just thinking I didn't have a daddy, and was born out of thin air. I only found out more information about my dad last year when my mum told me his name, and the whole backstory on how I was conceived. So, naturally as soon as I found out his name I done a bit of internet searching, and found nothing, and slowly began to forget about it. Roll on nearly a full year and I got a bit curious again, and I ended up finding him on Facebook, along with my 5 brothers and sisters, none of which know i exist. Im really contemplating adding him, and letting him know he has a 19 year old daughter, but I dont imagine that would go down too well seeing as he hasn't heard from my mother since the night they made me.  It is also definitely him as I showed my mum and she has confirmed it.  Has anyone else went through something similar and what was the reaction of this person finding out they had a daughter/son they didn't know about? I'm afraid of rejection, even though technically I have nothing to lose.

Can you provide a brief overview of the text?
<bot>: I have found my father who doesn't know I exist, should I let him know risking rejection, or just leave it?