Thanks pretend my name is witty and si_blakely for the back ground information.
That’s my father! - - Minus the “Altruistic” part. 
That’s an awfully wide gorge to jump. Adopted children were born of different parents. They have absolutely no blood relation whatsoever to their adoptive parents – but they do to those that gave them up for adoption. Children born from sperm do have a blood relation – to the mother. That they share about half of their genetic material with some complete stranger who wanked into a cup some time ago doesn’t seem to have a whole lot of relevance by comparison.
Why? I mean, inform them of whatever the genetic defect is and that it’s treatable because it was caught early enough (if that is indeed the case), but why do they have to know that this information came courtesy of this utterly anonymous bloke’s spooge pudding? Why does the donor even have to enter into the equation?
But adoption is very different. You were born of a whole other set of parents in that case. In sperm donation, your mother is your mother – your real mother. Your father may not be your father genetically, but he is in every other way that matters, and your biological father – well, he was never part of your life for any longer than it took him to thumb through a few pages of Hustler and replace the lid. Barring any genetically passed physical or psychological issues that might make you want to understand the person you inherited them from, I can’t see any reason why his identity would matter in the slightest.
Jeez, that could sensibly be put on lots of birth certificates – sperm donor or not!