Our product and our sum always give the same answer. Who are we?

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?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What am I?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Can you find the mistake in the below statement?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?