There has been no explaining so far .... let me explain. D7 then D6 used to love sleeping with mom so every once in a while we would let her sleep in our bed. Well, the once in a while became a regular thing. It is normal to her now. I remember a few months ago we tried to make her sleep in her own bed and her reaction was pretty agressive. Anyhow, the short answer is so far no explanations neccesary on my end. Sorry I can't be more helpful.
By the way, I think I will ask W to delay the announcement unless she is 100% sure that this is not fixable. I don't want to hurt D7 needlessly.