"One's Plans Affects Everyone" joke

Boss said to Secretary: For a week we will go abroad, so make arrangement.
Secretary makes call to Husband: For a week my boss and I will be going abroad, you look after yourself.
Husband makes call to secret lover: My wife is going abroad for a week, so lets spend the week together.
Secret lover makes call to small boy whom she is giving private tution: I have work for a week, so you need not come for class.
Small boy makes call to his grandfather: Grandpa, for a week I don't have class' coz my teacher is busy. Lets spend the week together.

This Grandpa is the boss of this story.
He makes call to his secretary: This week I am spending my time with my grandson. We cannot attend that meeting.
Secretary makes call to her husband: This week my boss has some work, we cancelled our trip.
Husband makes call to secret lover: We cannot spend this week together, my wife has cancelled her trip.
Secret lover makes call to small boy whom she is giving private tution: This week we will have class as usual.
Small boy makes call to his grandfather: Grandpa, my teacher said this week I have to attend class. Sorry I can't give you company.
Grandpa makes call to his secretary: Don't worry this week we will attend that meeting, so make arrangement.