Answer:
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
An open ended barrel, it is shaped like a hive. It is filled with the flesh, and the flesh is alive!
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own.
I am your mother's brother's only brother in law. Who am I?