What is the word or phrase?

What does it mean?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Where do fish keep their money?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Aaron, Brad, Christopher, Danny and Elvis decided to play a game of tiddlywinks. In this game they decided that one win will get 1 point for winning, 0 for losing and 1/2 in case of a tie.

They finished the game in alphabetical order and it was found that the scores were different for each person.

Based on the following two statements, can you find out the result of the individual games?
Brad: No one could finish like me, without a loss.
Elvis: No one played worse than me, I finished without a single win.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

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