Which number should replace the question mark?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

How can you leave a room with two legs and return with six legs?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?