Thestrals {WTM}

Percy had always been curious about his mother's past. Sally Jackson sometimes had nightmares that sounded as vivid as demigod nightmares. Sally Jackson sometimes had a British accent. Sally Jackson somehow knows Hades and gave him an earful when he kidnapped her. Sally Jackson was noticed by Nico for the energy around her, but does Sally answer their questions-nope.
So one day when they wake up in front of a big screen and being told they would hear about the life of The Girl-Who-Lived, the Most Powerful Witch of Her Age, Second Generation Marauder, Descendant of Death-Hemlock Potter, how do the gods and demigods react when they find out Sally and Hemlock are the same person and therefore Percy has a bit more godly blood than he thought-and why is one of his mother's magic buddies calling him a human thestral?

(I wanted to my own take on this)
(I don't own Harry Potter or Percy Jackson)