1981 the Potter family was attacked by the Dark Lord, he killed Lily and James Potter, when he wanted to kill Harry a spell bounced off the boy's forehead and killed Voldemort.

Dumbledore and Sirius showed up at the Potter mansion and what they saw shocked them.

Sirius - Peter's a traitor, I'll kill you.

Dumbledore- stop, Sirius.

But Sirius wasn't listening, he ran after Peter.

Dumbledore took Harry carefully and teleported to the Dursleys' house on Yew Street, number 4.

He knocked and the door was opened by Petunia.

Petunia- what can I do for you Headmaster?

Dumbledore-Petunia I'm sorry, Lily and James are dead they were killed by the dark lord.

Petunia-began to cry.

Dumbledore-I'm sorry.

Petunia- is that my nephew, Harry?

Dumbledore-yes.

Petunia- I'm taking him and we're leaving.

Dumbledore- he's 11 years old, he's supposed to go to Hogwarts.

Petunia- all right.