What Am I Riddles

Question: I give you a family of three:

One is sits down, and will never get up.
The second eats as much as is given to him, yet is always hungry.
The third goes away and will never return.

What are they?

Question: I do good things, but one small push could be a horrid disaster! I am normally used for decoration now.

Question: I am something, a lot of people don't like me, including you,but I'm called upon anytime one is injured. I like playing with pregnant women, I'm a 5 letter word, and if my last letter is put before first letter, I become a name of a country, WHAT AM I? IF U GET THIS, U'RE INDEED A GENIUS.

Question: I rule the ends of the universe. I control its laws. I reign the galaxy. The start of space is the start of me. The end of the universe is the end of me. The name of my slaves bring mighty terror to you. The universe wouldn't work if it wasn't for me. What am I?

Question: The more you cut into me the bigger I grow, what am I?