OMG ! As a Mam Mam this was a sweet story for me.
I was beginning to think you had what they term “ blue baby. ” (a very perceptive child that sees or speaks with those that have passed. )
When you mentioned Oma ( the psychic grandmother) I was almost sure of this phenomena . Wth,I have Lithuanian grands… we know these things happen.
Nice surprise however. Elmo did it! In the bathroom with a sponge by a diaper. LOL Who needs Clue?