Disclaimer: I don't own Harry Potter though a few of the characters are my own creation like Rose
Summary: What if the fates let Harry's parents live that night he got his scar, plus gave him a younger sister and become friends with the Weasleys, especially Ron earlier. What would be different?
Prologue: Where it all began
October 31, 1981
At the edge of the woods on the outskirts of the village of Godric's Hollow, an elderly man with snow-white hair and beard appeared out of nowhere. His name was Albus Dumbledore. He had come from Hogwarts School of Witchcraft and Wizardry right after the end of the Halloween Feast, feeling that something was dreadfully wrong somewhere.
He walked around the village to the other side, toward a two-story house set apart from any other. As he neared it, he stopped, his magical senses having detected no sign of the wards supposed to be on the house.
Then, several flashes of multi-colored lights appeared in the windows on the ground floor of the house. Dumbledore noticed that the front door was askew and wide open.
With no further hesitation, he apparated directly into the living room. Appearing with barely a sound, he saw three Death Eaters standing with their backs to him. One of them had his wand out, focused on a man writhing on the floor of the living room, apparently in pain from the Cruciatus curse.
Before they could detect he was there, Dumbledore quickly stunned the three Death Eaters then conjured ropes to bind them securely.
He then checked on the man who was being tortured, confirming that it was James Potter. James was alive but unconscious. Dumbledore conjured a stretcher and levitated James onto it.
He stepped up to the captured Death Eaters and removed their masks, revealing them to be Rodolphus Lestrange, his wife Bellatrix and his brother Rabastan.
Then, he heard a loud bang coming from the second floor. Harry! Lily! Rose!
Dumbledore apparated up to the top of the stairs. He hurried to the first room, Harry's room.
There, he found Harry sitting in the midst of his wrecked crib, apparently unharmed. Then, Dumbledore noticed a strange lightning shaped scar on the boy's forehead, still oozing a little blood.
A groan drew him toward the side of the room, where he found Lily under a small pile of wood. Dumbledore quickly vanished the wood.
"Ma," Harry cried. He started to crawl toward her.
"Hold it, young one," Dumbledore said. He picked up the boy along with a toy snitch that was in the ruins of the crib, "Here, play with this for a while."
Dumbledore then conjured another stretcher and levitated Lily on to it. He then heard crying from further down the hall. He hurried down to the next room, which was the Potter's master bedroom.
In another crib beside the master bed was the latest addition to the Potter family. Rose Lily Potter had been born in this house at the end of August, right after the Potters had moved in. She was a lovely girl with Lily's red hair and James' hazel eyes.
Dumbledore gently picked her up and placed her on the stretcher beside her mother. Still carrying Harry, he then moved the stretcher down to the ground floor.
After placing Harry on the sofa, he moved to the fireplace and threw some floo powder into it. "Remus Lupin," he called into the greenish flames.
After a few seconds of disorientation, he saw a man with short light brown hair and threadbare robes sitting in a kitchen.
"Professor Dumbledore!" he said, after noticing his former headmaster's head in the fireplace, "What is it? Is something wrong?"
"Yes, Remus," the elderly wizard replied, "I am at the Potters' place in Godric's Hallow. They were attacked by Death Eaters. I believe Voldemort was with them but I am not sure where he is now."
"Death Eaters! But how, Professor," Remus exclaimed, "What about the Fidelius charm?"
"I wondered about that myself, Remus," Dumbledore said, "Where is Sirius?"
"Right here, Professor," a new voice spoke out from behind Remus, "I was about to go to bed but I heard your voice. Come on, Remus. Let's get over there.
A few minutes later, both Sirius and Remus were in the Potters' living room, looking at their two friends. Sirius was holding Rose while Remus was carrying Harry.
"So, Sirius," Dumbledore said, "You said that you changed places with Peter as the secret keeper?"
"Yes, Professor," Sirius said, "We did that because I thought Voldemort would go after me, knowing that James and I were best friends. I thought that they would not suspect Peter to be the secret keeper."
"It seems you were wrong," Remus said, "Otherwise, how would they have found out about this place."
"For now, we have to get James and Lily to St. Mungo's so they can be properly treated," Dumbledore said, "The aurors can take care of these three."
"Okay, Professor," Sirius said, "Remus and I will take care of Harry and Rose while their parents are at St. Mungo's."
"Do you know how to take care of two children, Sirius?" Dumbledore asked with a small smile on his face.
"Um, not really, Professor. It can't be that hard," Sirius replied, ignoring the smirk of amusement on Remus' face, "After all, we've seen Lily and James do it often enough."
"Maybe you can do fine with Harry," Dumbledore said, "But with Rose being so young, it may be more difficult. Besides, the two of you have to find Peter and discover how Voldemort bypassed the Fidelius charm."
"All right, Professor," Sirius said begrudgingly, "But then who will care for the two kids?"
"Oh, I think I have the right family to care for them for a few days," Dumbledore said, "I believe you both have met Arthur and Molly Weasley from the Order?"
"Oh yeah," Sirius said, "They're the redheaded couple, right. I think they got several kids, all boys."
"Yes and no," Dumbledore said, his eyes twinkling, "They are both redheads, yes. But while they do have six boys including one Harry's age, they also have a new baby girl, who was born only two weeks before Rose."
"I guess that's all right, Albus," Remus said, "With so many kids, they should be able to care for Harry and Rose."
"Good, that's settled," Dumbledore said, "Now, let's get James and Lily to St. Mungo's."
Much later, Sirius and Remus were dozing in the waiting room of St. Mungo's. Harry was busy playing with his toy snitch while Rose was fast asleep in Remus' arms.
Sirius' head came up when he heard approaching footsteps. He saw Dumbledore and stood up.
"Well, Professor? How are they?" he asked the elderly man.
"They're going to be fine, Sirius," Dumbledore reassured him, "In spite of being under the Cruciatus curse, James will be recovered after a few days of rest. Lily has a possible concussion, so she needs to be observed for a day or two."
"Have you found out what happened, Professor?" Remus asked.
"Yes, Remus. I managed to talk to Lily before the healers gave her a Dreamless Sleep Potion. It seems that Voldemort blasted his way into the house with three of his Death Eaters. James made Lily run upstairs to protect Harry and Rose. The three Death Eaters kept James occupied while Voldemort chased down Lily. He caught her inside Harry's room just as she was about to pick him up. She tried to block his way but he blasted her aside. Just before she lost consciousness, she saw Voldemort cast the Killing Curse on Harry."
"Then why isn't Harry dead?" Sirius asked, "What happened to Voldemort?"
"It appears Lily's attempt to protect Harry passed on some form of blood protection to him and somehow reflected the Killing curse back at Voldemort," Dumbledore said, "It hit Voldemort and he vanished in some form of explosion,"
"Then Voldemort's dead?" Remus asked.
"I'm afraid not, Remus," Dumbledore said, "Remember the prophecy."
"You mean that Harry's the one mentioned in it, Professor?" Remus asked, "Not the Longbottom boy?"
"Yes, Remus," Dumbledore said, "Tonight, Voldemort marked Harry as his equal. That scar on his forehead is a residue of the Killing Curse. This fulfills part of the prophecy. Somehow, Voldemort will return someday and Harry will have to face him to completely fulfill it."
"Poor little guy," Sirius said, watching his godson playing, "He shouldn't have to do that."
"I know, Sirius. At least we and his parents will be here to help him prepare for that final confrontation," Dumbledore said.
"Albus, we're here," a female voice came from behind them.
Turning, they saw a small plump woman in her thirties holding a baby in her arms. Beside her were two small boys, one of them holding the hands of a toddler. All had red hair.
"Ah, Molly," Dumbledore said, "You're right on time. I believe you've met Sirius Black and Remus Lupin?"
"Yes, Albus," she replied, then turned to the two, "Hello, Sirius. Hello, Remus."
"Good evening, Mrs. Weasley," the two men said, together as they stood up.
"Please, call me Molly," she said. Then, gesturing at each child, she said, "This is Bill, Charlie and," gesturing to the toddler, "Ron." Nodding toward the baby in her arms, "This is Ginny. Bill, please hold onto her." She passed the baby to the oldest boy.
Remus approached her, "This is Rose," he said to her as he placed Rose in her arms.
"Oh, she's a sweet girl. She looks almost like Ginny," Molly said, smiling and gazing down at her. She then looked at Harry, "I assume that's Harry."
"Yes," Sirius answered. He then bent down beside Harry.
"Harry, Mrs. Weasley is going to take care of you for a bit while your mum and dad are resting, okay? Uncle Remus and I have to look for Uncle Peter," Sirius said to him.
Harry looked up at Sirius with a curious look on his face. He looked at Molly then back to Sirius before smiling and playing again with his toy snitch.
"Charlie, place Ron next to Harry so they can play," Molly said to the second boy.
"Right," Sirius said, standing up, "come on, Remus. We'd better get going."
As he and Remus walked down to corridor toward the entrance, Sirius looked back for a second. He was a bit surprised to see Harry allow Ron to hold his toy snitch since the boy had refused to let go of it since he gave it to him for his birthday. He smiled to himself thinking that Harry had made his first friend.