A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

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

What is it?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Be active and find the killer in the picture Riddle below.

When my father was 31 I was 8. Now he is twice as old as me. How old am I?