Answer:
I am the noblest musical instrument
What is the edge of earth and bread?
Although I am still, in families I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?