Further Embarrassment: The House Key

As previously mentioned, our house's previous tenants were a family of 4, including 1 teenage daughter. My roommates received the keys to the house and one would go to me. One key would let me in and out at my leisure, whenever I pleased. That key would be... green, with little dragonflies and sparkling flowers on it. Yes, I inherited the daughter's old key and the promise that my roommates would make me another copy when they got the chance. They did! In fact, now I have like 4 different keys to the house. One for this door, one for that one and one for that one and one for that one. What does someone need so many different keys for? Why not one key to rule them all? All roads would lead to Rome. Simplicity would be restored. Things would make sense.