What is so fragile that saying its name breaks it?

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

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

What do you answer even though it never asks you questions?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?