We decided to come out to our 18 y/o daughter and our 13 y/o son a few months back. We are pleased that we have brought up such grounded kids. Our daughter said "Thats nice. I figured something was up, but couldn't be sure till now. It's not for me, but it seems to work for you guy I guess. But mom, S? REALLY? S? Couldn't you do any better?" And we all laughed. Our son said "Whatever. It's your life, not mine."
So our kids know, and it's such a relief not to have to hide it from them anymore.