Harry had never been able to comprehend a sibling relationship before, but he always thought he'd be great at it. Until, as Master of Death, he's reborn one Turais Rigel Black, older brother to Sirius and Regulus. (Rebirth/time travel and Master of Death Harry)

Hermione's destiny is altered by the Powers that Be. She is cast back to the Marauder's Era where she is Hermione Potter, the pureblood fraternal twin sister of James Potter. She retains Hermione Granger's memories, and is determined to change her brother's fate for the better. Obviously AU. Starts in their 1st year. M for language, minor violence, etc.