@DLoozional,
I'm a woman who has been following along and agree with ehBeth's views, including that it is your decision.
I think children in the social set will be less harrowed if it all doesn't get brought to light, and, hard as it is to imagine right now, possibly better for dealing with each other in the future. Maybe some of those marriages will resolve without 'interference', one way or another.
On the lack of worry about stds, I see why you want to tell, sympathize re concern about what is right on that. I think I wouldn't, but understand.
There's another thing, and I've no idea of the stats on this, but a lot of times people know something in a marriage is off; their antennae will already be up a bit.
On your house, your life's work, I really understand.
The trick is to not hate/be bitter about all that energy into it. It was a good part of your life, and not the house's fault. Try and keep some of the fondness and pride in it, even if you lose it.