Little Changes

Hermione is accidentally turned into a child by Neville during Potions, but Hogwarts isn't safe for a muggleborn child to be in with Umbridge taking over. Dumbledore sends Hermione away to be taken care of by Sirius and Remus to protect a secret. Why wasn't she sent to her parents? What secret was Dumbledore keeping? ADOPTED FROM SUNRISESHADES. Hermione/Theo later on. Implied RL/SB