Her: Sienna outed me on the drive over. "Are you a poly mama?" [My daughter] didn't miss a beat, and just started talking about another boyfriend I used to have, long before marriage.
Me: Wow. Whoopsies. Sienna has been wanting to converse with me about this [polyamory]...guess she's a bit too savvy for discretion. (Or not savvy enough.) Good thing you had that old boyfriend!
Her: I figured [my daughter] would hear it from Sienna first! I'm glad I was there to hear it. [My daughter] really didn't seem to see a relevant distinction between a boyfriend I had when I was single and one I have now.
Me: And why should there be? ;-)
Her: Exactly. And how nice (for both of them) to know that other kids' moms do this too.
Me: I do think that's a good thing. Definitely.
Her: My mom has been worried about the horrible shock should the girls learn of this disturbing arrangement. Ha!