...I think I'm your daughter.
Dear Sir Peter,
If you'll excuse my being so forward , Sir, but I think I'm your daughter.
From what I've been able to ascertain so far, Sir, my mother was in your parent's employ as a housemaid from the summer of 1968 until early 1969. I shan't give her name here, Sir, but I think you'll remember her: she had fair hair, blue eyes and she took your virginity...or should I say, you took hers.
Given what little I know about your background, Sir, and the dates, places etc, I have a sneaking suspicion that you and I may be biologically related.
Please don't think that I am telling you this in order to weasel my way into your vast fortune, Sir, I am a very modest person and am happy and content with the life that I have made for myself. I merely wish to make myself known to you, and have no expectations of you. I simply wish to know the truth; to know if you are indeed my father. If you are, I will be greatly honored to call a man of such esteem and greatness as yourself "Dad" (or "Pater", if you prefer, it's a little more refined, don't you think?).
Thank you for your time, Sir. I look forward to your reply.
Your (perhaps) daughter.,
Dharma.