If you say my name, I will no longer exist. What am I?

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

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

A man dies of old age on his 25 birthday. How is this possible?

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

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

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

Count the number of triangles in the given picture.