Since I originally responded to this recently re-surfaced post, things for us have changed, in terms of the spread of awareness of our lifestyle.
Sparing the detail, the circle of those in the know now include at least one of my daughters, her husband, my ......'s "BFF," and one of KK's former (really her last romantic) affair partners. It's almost certain my other ...... is aware, at least on some level, as the probability of sharing between her younger sibling, and my wife is very, very high.
We've kind of laid low since all this unfolded. Our situation now is more poly than anything else, so there's no consequent lack of hot sex, but we're consciously trying to be less public or risky venues kinds of things.
One of my learning experiences in this; mom's apparently share a lot more with a ......, perhaps more even than a husband.