Her Tortured Heart - Mattheo Riddle

Harry has an older sister called Daniella Rosemary. Danni Was 11 when her parents died. She wants to look after Harry but he gets separated from her right after the incident and goes to live with Remus. Danni has nightmares every night from the time she watched her mum die. When she is old enough Danni becomes Harry's legal guardian but he runs away to hunt horcruxes. She meets up with her old pupil Mattheo Riddle. Although they used to share a mutual hatred they help each other to survive the war. After the war, life restarts for them and they realise that life wasn't the same without each other.