Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

Where do fish keep their money?

Why did Buffon take the goal with him after every Juventus match?

What is black when you buy it, red when you use it, and gray when you throw it away?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

What can go through glass without breaking it?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?