Underneath their Falsehoods

Harry is abandoned by his parents after he is diagnosed as a squib, what nobody realises is that there is something else afoot His Brother Francis is The-Boy-Who-Lived, but it's possible that Harry is too, or maybe they both are. Who knows with magic. Features Dursleys who have their own traumatic pasts, and several characters are not the same. This is AU and Sly!Harry.