This is where, instead of killing Harry's parents, Voldemort only powerfully stuns them. Lily still protects Harry, and that is enough for the killing curse to rebound. It is set when Harry's a toddler.
Tom Riddle, Aka Voldemort, and Bellatrix Lestrange have a baby girl.
When Harry 'defeats' Voldemort the first time round and Bellatrix is placed in Azkaban for torturing the Longbottoms, she's sent to live with the Grangers, for neither of her parents to find her.
⚠️Fred Weasley x OC story⚠️
[EDITING IS IN A SLOW PROCESS]