Mother and Son in a tête-à-tête

Mother: Son I'm sorry I slept with someone that
is not your dad 23 years ago. And that person is your real father.
 

Son: Mum, what rubbish! How am I to deal with this?! You should
be hanged.

Mother: I am sorry he is my first love and i could not marry him
... cause we are of different religion. He is on the phone at the moment
and wants to speak with his son for the first time ever. 

Son: No i am speaking to no one. Mr Smith is the only father i know
and so will that be. 

Mother: Please don't be so upset. Just talk to him.
Son: Ok, I will give him a piece of my mind! 

Phone: Morning Son, I am Bill Gates. I am your real father. 

Son: Dad! Dad!! Dad!!! Thank God! Ohhhhhhhhhhhh Thank God!!!!!!Lov u so much Dad!!!!! I always knew there was something special about me...
Thank you soooooo much mum. You are the best mum in the whole wide world!