My first reaction was "WTF they didn't know?" but then I realized that given your lifelong hatred of other human beings it could easily not have come up before. Glad they're doing OK with it.
Oh, it was a surprise to no one. My -mother- had known for years, really. Thing is that tends to really... well, get swept under the rug when you lose your virginity at age 22 and then avoid any sort of relationship pursuit (which includes eye-to-eye contact with people for more than ten seconds) ever since. My father didn't know, but he's hardly surprised (hay guyz what do you think of the kid who never ever brought a girlfriend home even though he's like 25 now). Neither was my middle sister when I told her. I expect a bit of surprise from the eldest one due to sheer obliviousness and the fact she once dated a guy who turned up being gay as a sailor once, but that's it.
So, yeah, lifelong hatred of people sorta explains this.
The difference, now, is that my sexuality is no longer a non-factor and all, but everybody has been pretty supportive.