Change Sprite for Prefab have been nested?

Hi every one, i'm newbie on unity gamedev. I making my first game and i have 1 big problem.

I'm making 2d game and now, i will explain my inssue.

1. You can imagine, i creating 1 house. First i will create door, roof with sprite, and i use sprite sheet by slice in editor, not sporadic sprite. Then save this like prefab.

2. I decorate my house with door, roof prefab i created before. And then i save house is prefab. I create many house like this.

3. I have some change in my sprite, i want to remove all of old sprite of door, roof , but i can't, when i change sprite of 1st prefab like Door(i created before), it's not change this sprite on House prefab.

So do you have any solution for me? Thank so much!