Answer:
I am a word. I become longer when the third letter is removed.
kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
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I am a rock group with four members. All dead one was assassinated.
I am your mother's brother's only brother in law. Who am I?