Answer:
I am your mother's brother's only brother in law. Who am I?
I'm a god. I'm a planet. I measure heat.
where do turkeys dance
What pulls you down and never lets go?
Where humans breathe liquid.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.