Find an interesting joke

Once upon a time, there was a scholar who had a stupid son. One day, a friend will visit him. In order to show his talent, he decided to let his son entertain the guests, and specially taught him a few words: "If the guests ask you why our peach trees are gone, you can say,' Let me cut them down and sell them';

If he asks you why our fence is so messy, you can say' it was destroyed by the war';

If he asks you why there is so much money in our family, you can say,' My parents earned it hard';

If he asks you how you are so smart, you can say,' Of course, it has been in our family for generations'. "

So the son went to entertain the guests. The guest asked, "Where's your father?" The son replied, "I'll cut it and sell it!" " "

The guest was surprised and asked your mother? The son replied, "The war is over! "

The guest asks again: "Is there so much cow dung in front of your house?" The son proudly said, "My parents worked hard to earn it!"

The guest asked angrily, "How can you say that!"

The son proudly said, "Of course, our family has been like this for generations!" " "