Can you solve this picture maths equation?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

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

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.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Find the number of squares in the below picture

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?