My Car Keys

I have 3 keys on my ring that control my whole world. One key of course is for my jeep. I love my jeep. I've considered living in it if i ever needed to. The seats lay down and it would be real comfortable. Anyway, My jeep is my prize possession right now. It's the one thing I own worth more than $100. Another key on my ring is for my house. But somehow someway it's really tricky and I can never get in. You see this key only works the dead bolt on the front door, so if someone locks the handle I'm out of luck. It will unlock the backdoor but who wants to walk to the back? We've all seen that on scary movies before. It's never a good sign when they have to get into the house from the back. Now the third key is a mystery. My dad gave it to me but we aren't sure what it works. It's not a house key or a key to my parents' car. It's just useless.