What is the word or phrase?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What brings you down but never up?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

What is the relationship between these matchstick pictures below?

You can see it everyday, But cannot touch it at will. What is it?