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

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

What has many keys but can’t open a single lock?

Find the Goldfish below the given Image.

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

Can you count the number of blocks in the picture below?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Move four matchsticks to the below square to form three squares?