Can you replace the question mark with the correct number?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

How many Watermelons are there in the below picture?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

What does this Rebus Picture means ?

You need to remove two matchsticks to make the below equation true. Can you do it ?

Can you find the key in the picture below?

Can you name four days which start with the letter 'T'?

Can you spot the man between the coffee bean in the picture below ?