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

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Which tank will fill first?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Why are televisions attracted to people?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

What do you call a fish without an eye?

Why is the longest human nose just 11 inches?