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

When we see 2 but call 10?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

No matter how little or how much you use me, you change me every month. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Why is the Hole below a Lock?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

How can you make a TV, a bed, a dog, and a car liquid?