Answer:
Up on high I wave away but not a word can I say.
It's a game played by serious people that takes place on a global scale.
It is a part of us, and then replaced. It escapes out bodies, to a better place. The world becomes its sizeable home. Its passions unrestraint, the planet it roams.
A mighty weapon in the war against winged household pests.
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonΒ One empty, and one full.
I am your mother's brother's only brother in law. Who am I?