The centre of the third figure is empty. What digit should fit inside?

Be active and find the killer in the picture Riddle below.

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?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Why is Saturday stronger than Monday?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Can you solve the below rebus?

What do you get if you add 2 to 100 four times?