Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

I shave every day, but my beard stays the same. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

If your uncle’s sister is not your aunt, what relation is she to you?

A father's child, a mother's child, yet no one's son.

Who am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?