I have teeth but i don't bite. Who Am I ?

What will you call your mother's brother's brother-in-law?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What goes up but never comes down?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

It belongs to you, but other people use it more than you do. What is it?