Answer:
What can you throw but not catch?
What relies on columns but isn't a house, and asks for help but can't speak itself?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
My love, when I gaze on thy beautiful face. Careering along, yet always in place, the thought has often come into my mind. If I ever shall see thy glorious behind.
What has a big mouth, yet never speaks?
I am your mother's brother's only brother in law. Who am I?