What will Dr Sadao and his wife do with the man?

What will Dr Sadao do to get rid of the man?

A man and his wife is standing at the door.

A man said to a woman, 'The son of your brother, is the brother of my wife".How is that woman related to the wife of that man?

For a party 7 guests are invited by a husband and his wife. They sit in a row for dinner. The probability that the husband and his wife sit together, is

For a party 7 guests are invited by a husband and his wife. They sit in a row for dinner. The probability that the husband and his wife sit together, is

Who was Dr Sadao? Where was his house?