Thank you for your entry!!! I am really digging all of the entries so far. I liked that the idea of the imaginary friend. For me, Phi was the girl in white.
The line about the shadow never lifting from Mum and Dad’s hearts made me think that maybe it wasn’t an imaginary friend after all, that maybe Phi was the ghost or memory of a sister Charity once had. I also agree that I pictured Phi as the girl in white in the photo!
The shadow never lifting was a reference to the last lines of “The Raven” by Poe, actually, but used a bit differently as this shadow has a manifestation in the physical world. Thank you Someday! I love your comments.