Solution:

Whole of the family is playing monopoly and the girl is winning the game.

Solution:

The wife booked a two way ticket for herself and booked a one way ticket for her husband.

Solution:

Trojan evidently was the one buried.

Solution:

NEELAM.

Explanation:
Just read the car's number upside down and you will know why.

Solution:

Sweden and Denmark ---> Swedenmark
Russia and Belarus ---> Belarussia

Like we said, there can be many other combinations. If you have found some ones other than these, use the comments section.

Solution:

One of the parrot have just decided to fly away. It has not yet taken that action. Thus, there are still six parrots sitting on the branch of the tree.

Solution:

It is at the North Pole.

The winds are blowing towards the north till they reach the pole. The moment the pole is crossed, they are blowing towards south.

Solution:

He is a barber.

Solution:

The worth of that coin is zero. This is because the B.C. and A.D. dating system was not empowered till the year 525. So the coin is probably fake.

Solution:

It is perfectly feasible. The forty elephants had forty foreheads.