"Pres. Singh Singh buys some common sense" joke

This is about a day when Mr. Zail Singh was the President of
the country.
All sardars in the country went to him this day and told him
that people
tease them by making jokes about them that when the clock
stucks 12: 00,
all sardars go mad and act like crazy. They complained that
this is not
true. They also complained that people talk about sardar
having no common
sanse. Therefore, they demanded him to go bring for them
common sense.

Mr. Zail Singh was confused and asked his secretary to give
him some suggestions. The secretary advised him to go to Japan, since quality is guaranteed.

The next day Mr. Zail Singh rushes off to Japan. At the
Osaka Airport he
hires a cab and asks him to take him to a shop where he
can get common sense.

The cab driver was pissed, he told him that there is no shop
in Japan that sells such stuff. Infact every human being has common sense since birth. And that one should know how to make use of it. Mr. Zail Singh asked him to explain in detail.
He started explaining by giving an example. The example was
that there are 4 members in his family, his wife, his son, and
his daughter. He then
asked Mr. Zail Singh to guess the fourth members of the
family. Mr. Zail Singh said, "How am i supposed to know
who is the forth member in your
family". The driver said, "fool, its me"

Mr. Zail then understood and said,"oh! is this what common
sense is?,
Indian sardars are fools and stupid, this is so easy"

The next day he goes back to India and announces all
sardars to get together for a mass sardar lunch. He starts
explaining with the same example. He says," there are 4
members in my family, my son, my daughter, and my wife,
guess who is the fourth one?". All sardars shouted,
"We don't know".
He then yells at them,"You fools, stupid, good for nothing. It
is so simple, the fourth member of the family is that taxi
driver"