I am round, a size of a fist, sweet but has so many seeds

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

I have keys, but no locks and space, and no rooms. You can enter, but you can’t go outside. What am I?

What month do people sleep the least?

What has many keys, but can't even open a single door?

What is as fast as a cheetah as slow as a turtle and can transform into any shape or object?

Some months have thirty days and some have thirty-one.

How many have twenty-eight days?

What belongs to you but others use it more than you?

David's father has three sons : Snap, Crackle and _____ ?

How many letters are in alphabet?

What occurs once in a minute, twice in a moment but NEVER in a thousand years?

What has four fingers and a thumb, but isn't alive?

Take off my skin – I won’t cry, but you will!

What am I?

If you have me, you want to share me. If you share me, you haven't got me. What am I?

Everyone has me but not always at the same time, some don't have enough of me, some too much of me, or some just right.

People have me whenever they are able - should it be day, morning or evening.

I'm the rare case when today comes before yesterday.

What am I?

What goes all the way around the world but stays in corner?