Sally Riddle?

This story takes place in Harry Potter and the Order of the phoenix. The order discovers that their old friend, Sally Jackson, is actually Lord Voldemorts daughter. They track her down and find out from Professor Snape that Voldemort is after her son, Perseus Jackson. Will the Wizarding world accept Percy even if he's the grandson of You- know- who? Are the demigods willing to let Percy go to this special world?
(I do not own the characters and the real story is of course, and you can just read this as a little fun project from a fan-girl. This is my first time so if you find some mistakes, I'll be thankful for the feedbacks. )