Answer:
Touch this and you'll regret it. But if it's cold, you won't forget it. What is it?
I am your mother's brother's only brother in law. Who am I?
I start in little but I end in full, you'll find me in half and complete.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair
An utensil used for bread. Also a paper cutter. Used by a thug to take a life, Or wielded by the tamest wife, When used to spread the butter.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?