What does this rebus riddle means ?

Why is the Hole below a Lock?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

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

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Can you move 2 matchsticks to form four equal sized squares.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?