One a day a boy walked through a street with his grand father. And he saw that two dogs are fucking. He asked grand father " what are they doing grand pa". and grand father replys "they are trying to make a puppy".

After one week, that little boy saw that his parents are fucking in their room. And he asked his grand father "what are they doing" and ge got a reply as "they are trying make a little sister for you".

Suddenly, boy ran to his father and said "father, father! turn mum around and do it to mum's backside. So, we can have a puppy".