These are really weird. The only thing I've ever noticed is my sister (who's 6) once asked "what happened to my sister?" and we were all confused because no one had ever mentioned my step mums still birth before around the kids. We asked her to clarify, and she just said something "Mummy had another baby, I had a sister, but she's not here anymore?"
It took us a few months until we figured out she was talking about her cousin that my sister used to play "sisters" with and it's a corrupted memory almost
