Honestly, my kids (19, 15, 11, 4) haven't asked about why we sleep the way we do. They are AWARE that the sleeping arrangements changed a little over a year ago, but they never cared. It's CERTAINLY not secret and the youngest has commented that I have two rooms-but I just smiled and laughed with her that yes I do and if she wants two when she's grown up she can do that too.
Mostly-like RP said, they don't care if you are comfortable and content with the dynamic-they will be too.
"Love As Thou Wilt"