My Father

My father is visiting me in Moscow.  He is curious.  He asks many questions.  And he does not hear well.  So, the dialog between us goes something like this:

Father:  Why is X and why is Y?
Son:  X is explained in this way and Y is explained in that way.
Father:  What?
Son, speaking more slowly and loudly:  X is explained in this way and Y is explained in that way.
Father:  What?
Son, shouting now:  X is explained in this way and Y is explained in that way.
Father:  Why are you shouting?
Son:  Because you don’t hear well.
Father:  What?
Son:  Sigh … never mind.  Dad, while we are on the topic, why don’t you finally get a hearing aid?
Father:  A hearing aid?  I do not want to become dependent on anything.  Besides, it will make me look old.
Son:  Make you look old?  You are eighty-six years old.
Father:  What?

As for the last question, my father chooses not to hear me.