Logic Riddles

Question: If one cat is a mother, one cat a sister, one cat an aunt, one cat a cousin, one cat a grandma and one a granddaughter, how many cats are there?

Question: He Knows Everything!! But No one Knows him!!!

Question: There were 2 men climbing on mount everest when one man falls off the edge, the next day both of the men have dinner together. How can this be?

Question: There are three books on a shelf standing side by side. Each book is 10ml thick. The bookworm eats its way through the first page of the first book to the last page of the last book. How far did the bookworm move if it can only move in a straight horizontal line?

Question: What does this code mean?: YY U R YY U B I C U R YY 4 ME