I lost my IPhone is my house. It is dead and as been about a week?

Okay, I have checked every room in this house, under beds, in my lil bros room. In my room. Made a mess outta my room, in/under the couches. In the kitchen. Oh and it does not have "Track my IPhone" turned on. And it has no SIM. Please help I have checked EVERY piece of clothing I have, inside/outside of my dresser/bookshelves. I have looked in every nook and crany in this house. I'm 13 years old. I have asked everyone in my house, and I know my 7 year old brother didn't steal it because he is TERRIBLE at lieing, not once have I not been able to tell when he was lieing.

It's gone *****

The battery is already dead.
The phone has no sim.
The only thing you can do is to find it yourself.