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Jason Voorhees:

You were only a baby when he found you crying was because your mother left you outside alone with a note saying she couldn't take care of anymore but didn't tell you had a older sister. So instead of killing you Jason took you in as his little brother so it won't be just him anymore.

Michael Myers (3 years old):

He was out killing as it was Halloween as for you your parents were holding you hostage as they were criminals. You were trying to find help but that would only backfire. And as Michael notice house after a kill, he began to carefully step inside and went upstairs to find you in your room scared as Michael sees that you are his little brother so he killed your "parents" and took you to his house so that he'll never be alone ever again.

Freddy Krueger (6 years old) :

You already met Freddy in your dreams but instead of killing you he spared you and told you were his brother. That's when you were about to wake up so you touched his claw and pulled him out of your dream so you could have your brother with you but the problem was your foster parents so Freddy killed them so that way it was just you and him that way he'll never have to lose you again.

Leatherface (4 years old):

You were only four years old when he found you. Your parents abandoned you in a dumpster because you develop a love of murder and cannibalism that's when leatherface found you after capturing victims and knew everyone back at home would love to have you around.

Chucky (5 years old)

You got a good guy doll for Christmas but what you didn't know was that the doll was possessed by serial killer Charles Lee Ray and by the time your asleep chucky was alive but he didn't possesse your body because he recognize you as his brother so instead he killed your parents and took care of you since.

Harry Wardon (4 years old):

He was already your brother you just help him lure victims days before Valentine day's and after.

Norman Bates (3 years old):

He's your biological brother and you already know about his mother personality.

Brahams Heelshire (2 years old):

He's your biological brother and he's taking care of you after your parents death.

Otis Driftwood (6 years old):

He's your biological brother and took care of you before and after the firefly family took you both in.

Horny the Clown (3 years old):

He was your biological brother after the accident on his birthday you missed him but one night after he came back after a kill he found you at home and took you with so he could have his little brother back with him.